fix(rn-tester): restore RNTesterPods.xcodeproj/project.pbxproj on 0.83-merge

[tvinhas]

Summary

The RNTesterPods.xcodeproj/project.pbxproj file is missing from 0.83-merge but exists on main. Without it, pod install fails immediately on 0.83-merge with:

[!] The plist file at path /.../packages/rn-tester/RNTesterPods.xcodeproj/project.pbxproj doesn't exist.

Which blocks any contributor from validating any PR against 0.83-merge via the RNTester pod-install path.

Root cause (interaction between an ignore rule and the upstream merge)

Both main and 0.83-merge carry this rule in .gitignore:

/packages/rn-tester/**/*.xcodeproj

On main, project.pbxproj is tracked despite that rule — gitignore does not affect files already in the index, and the file was originally added before the rule existed (or via -f). On 0.83-merge, the file was dropped from the
tree at some point during the upstream-0.83 merge (likely via a git rm resolving a conflicting hunk, or via a merge driver that touched the .xcodeproj contents). Once it was out of the index, the existing ignore rule prevented anyone
from git adding it back through the normal path — the explicit -f flag is required.

Verification via gh api:

• main tree contains packages/rn-tester/RNTesterPods.xcodeproj/project.pbxproj (blob SHA 90e6c295ce0ec461333aa96af37d8b0ceebe98dc, 120,346 bytes).

• 0.83-merge tree only contains packages/rn-tester/RNTesterPods.xcodeproj/xcshareddata/ (the scheme files).

• The xcshareddata/ scheme files on 0.83-merge reference RNTesterPods.xcodeproj as their container, so the absence isn't an intentional structural change.

  Fix

This PR restores the file verbatim from main's blob 90e6c295… (force-added past the ignore rule). Once in the index, future operations track it normally. The .gitignore rule is preserved unchanged — it correctly excludes other
generated .xcodeproj outputs and only needed the one-time -f to reseat this specific file.

The .pbxproj is structurally cross-compatible between main (RN 0.81.x content) and 0.83-merge (RN 0.83 content) — both branches share the same target layout (RNTester, RNTesterUnitTests, RNTesterIntegrationTests,
RNTester-macOS, RNTester-macOSUnitTests, RNTester-macOSIntegrationTests, RNTester-visionOS). pod install regenerates the workspace from this file + the Podfile, so any drift between branches gets reconciled by the install step.

If maintainers have a preferred way to regenerate the pbxproj (script, fresh pod init flow), this PR can be closed in favor of that. The change is offered as the minimal unblock so contributors can resume validation against
0.83-merge.

Indirectly unblocks the "RNTester validation" item on the Road to 0.83 tracking issue (#2901) — that item can't proceed until pod install works on 0.83-merge.

• Before: pod install in packages/rn-tester on 0.83-merge fails with [!] The plist file at path .../project.pbxproj doesn't exist. Reproducible on any fresh 0.83-merge checkout. yarn prepare-ios hits the same error inside
  the cocoapods-runner subprocess.
• After: pod install in packages/rn-tester on 0.83-merge completes with Pod installation complete! There are 86 dependencies from the Podfile and 85 total pods installed. RNTesterPods.xcworkspace/contents.xcworkspacedata is
  generated, all Pods-RNTester* xcconfig files are written, hermes-engine script phases are wired. (Validated locally with HEAD = current 0.83-merge tip.)
• Remaining [!] ... CLANG_CXX_LANGUAGE_STANDARD override warnings are pre-existing on main and unrelated to this restore.

Related

• Road to 0.83 #2901 — Road to 0.83 tracking issue (this unblocks RNTester validation)
• Upstream blob on `main`: SHA `90e6c295ce0ec461333aa96af37d8b0ceebe98dc` (120,346 bytes)

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