Mark emeritus maintainers in sync data

[Rohithmatham12]

What this changes

• Reads the Istio community emeritus maintainer list during maintainer sync.
• Marks matching active maintainers as emeritus while preserving their existing maintained paths.
• Adds emeritus-only users to the maintainer storage data so downstream views can display them.
• Adds tests for parsing the emeritus list and case-insensitive maintainer marking.

Fixes istio/community#976.

Testing

• GOCACHE=/private/tmp/istio-bots-go-cache GOMODCACHE=/private/tmp/istio-bots-go-mod-cache go test ./policybot/mgrs/syncmgr

[istio-policy-bot]

😊 Welcome @Rohithmatham12! This is either your first contribution to the Istio bots repo, or it's been
a while since you've been here.

You can learn more about the Istio working groups, Code of Conduct, and contribution guidelines
by referring to Contributing to Istio.

Thanks for contributing!

Courtesy of your friendly welcome wagon.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Rohithmatham12 / name: Rohithmatham12 (faf327d)

[istio-testing]

Hi @Rohithmatham12. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Rohithmatham12]

Hi @istio/wg-test-and-release-maintainers, PTAL when you have a chance? This PR is waiting on code-owner review and /ok-to-test so the required Prow jobs can run.

CLA is already green from @linux-foundation-easycla, and I verified locally with:

GOCACHE=/private/tmp/istio-bots-go-cache GOMODCACHE=/private/tmp/istio-bots-go-mod-cache go test ./policybot/mgrs/syncmgr

Thanks!