[lockfile-explorer] Change error to warning for outdated pnpm-lock.yaml format

[EasonLin0716]

Fixed #5400

Summary

In pnpm v9+, the version field format dropped the registry.npmjs.org/ prefix. Teams using Rush.js may have members running different versions of pnpm, but they may not necessarily run rush update --full or rebuild pnpm-lock.yaml to normalize the version format — especially in large projects with many packages, where doing so could cause unexpected errors due to some packages not strictly following SemVer.

In #5377, support for pnpm v10 was added, but this also caused teams that haven't cleaned up their pnpm-lock.yaml to no longer be able to use it. My approach is to emit a warning instead of throwing an error as a workaround, so that teams encountering this issue aren't left blocked without knowing how to resolve it.

console.error at apps/lockfile-explorer/src/graph/lfxGraphLoader.ts:614 might still be invoked, but I think it is better than throwing an error and ending the process.

Details

Previous behavior: The code would throw an error when
encountering entries without a leading "/" in pre-v9.0 lockfiles.

New behavior:

• Added a module-level flag hasWarnedAboutOutdatedFormat to track
  if the warning has been shown
• When an outdated format is detected, display a warning message
  once: "Your pnpm-lock.yaml contains outdated version formats. Please
  run 'rush update --full' to fix this issue."
• The entry is still processed (slashlessRawEntryId is set), allowing
  the tool to continue working
• Warning only appears once per process execution to avoid spam

Backwards compatibility: This change improves backwards
compatibility by making the tool more tolerant of legacy lockfile
formats.

Performance impact: Minimal - only adds a single boolean check
per lockfile entry.

How it was tested

Manually tested by running lockfile-explorer against projects with
outdated pnpm-lock.yaml formats and verified:

• Warning message appears exactly once when multiple outdated entries
  exist
• Tool continues to function normally after displaying the warning
• No warnings appear for correctly formatted lockfiles

Impacted documentation

No documentation updates required.

[iclanton]

You need a changelog entry. Run rush change

[iclanton]

Does this only happen in a case when rush update --full will fix it?

[EasonLin0716]

changelog is added. Please take a look, thank you.

Does this only happen in a case when rush update --full will fix it?

This case happens when users haven't run rush update --full after migrating their pnpm version, especially from v8 to v9. Users can either run rush update --full or remove the pnpm-lock.yaml and run rush install again to fix it.

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