fix: retry post-creation API calls on 422 eventual consistency errors (#4356)

Add retry logic to handle GitHub API eventual consistency errors that
can occur after creating a new pull request. Follow-up API calls for
milestones, labels, assignees, and reviewers may fail with a 422
"Could not resolve to a node" error before the PR is fully propagated.

- Add generic `retryWithBackoff` helper in `src/utils.ts` with
  exponential backoff (default 2 retries, starting at 1s delay)
- Wrap post-creation API calls in `src/github-helper.ts` with
  `withRetryForNewPr()`, which only retries for newly created PRs
- Use `@octokit/request-error` `RequestError` type for precise error
  matching (status 422 + "Could not resolve to a node" message)
- Add unit tests for `retryWithBackoff` covering success, retry,
  exhaustion, and non-retryable error scenarios
- Update `dist/index.js` bundle and `package.json` dependencies

package-lock.json

@@ -16,6 +16,7 @@
         "@octokit/plugin-rest-endpoint-methods": "^13.5.0",
         "@octokit/plugin-retry": "^7.2.1",
         "@octokit/plugin-throttling": "^9.6.1",
+        "@octokit/request-error": "^6.1.8",
         "node-fetch-native": "^1.6.7",
         "p-limit": "^6.2.0",
         "uuid": "^9.0.1"
@@ -152,6 +153,7 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.24.9.tgz",
       "integrity": "sha512-5e3FI4Q3M3Pbr21+5xJwCv6ZT6KmGkI0vw3Tozy5ODAQFTIWe37iT8Cr7Ice2Ntb+M3iSKCEWMB1MBgKrW3whg==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@ampproject/remapping": "^2.2.0",
         "@babel/code-frame": "^7.24.7",
@@ -718,6 +720,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       },
@@ -741,6 +744,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -1635,6 +1639,7 @@
       "resolved": "https://registry.npmjs.org/@octokit/core/-/core-6.1.6.tgz",
       "integrity": "sha512-kIU8SLQkYWGp3pVKiYzA5OSaNF5EE03P/R8zEmmrG6XwOg5oBjXyQVVIauQ0dgau4zYhpZEhJrvIYt6oM+zZZA==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@octokit/auth-token": "^5.0.0",
         "@octokit/graphql": "^8.2.2",
@@ -2883,6 +2888,7 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.12.1.tgz",
       "integrity": "sha512-tcpGyI9zbizT9JbV6oYE477V6mTlXvvi0T0G3SNIYE2apm/G5huBa1+K89VGeovbg+jycCrfhl3ADxErOuO6Jg==",
       "dev": true,
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -3358,6 +3364,7 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
+      "peer": true,
       "dependencies": {
         "caniuse-lite": "^1.0.30001640",
         "electron-to-chromium": "^1.4.820",
@@ -4166,6 +4173,7 @@
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.57.1.tgz",
       "integrity": "sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -4412,6 +4420,7 @@
       "integrity": "sha512-whOE1HFo/qJDyX4SnXzP4N6zOWn79WhnCUY/iDR0mPfQZO8wcYE4JClzI2oZrhBnnMUCBCHZhO6VQyoBU95mZA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@rtsao/scc": "^1.1.0",
         "array-includes": "^3.1.9",
@@ -5990,6 +5999,7 @@
       "resolved": "https://registry.npmjs.org/jest/-/jest-29.7.0.tgz",
       "integrity": "sha512-NIy3oAFp9shda19hy4HK0HRTWKtPJmGdnvywu01nOqNC2vZg+Z+fvJDxpMQA88eb2I9EcafcdjYgsDthnYTvGw==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@jest/core": "^29.7.0",
         "@jest/types": "^29.6.3",
@@ -6864,6 +6874,7 @@
       "integrity": "sha512-Cvc9WUhxSMEo4McES3P7oK3QaXldCfNWp7pl2NNeiIFlCoLr3kfq9kb1fxftiwk1FLV7CvpvDfonxtzUDeSOPg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "cssstyle": "^4.2.1",
         "data-urls": "^5.0.0",
@@ -7702,6 +7713,7 @@
       "integrity": "sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -8568,6 +8580,7 @@
       "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -8904,6 +8917,7 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"