Update ownership of profile metrics controller package to mobile and extension platform

[ajeetd]

Explanation

Update code ownership of profile-metrics-controller to mobile and extension platform.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Ownership metadata-only change (CODEOWNERS/teams mapping) with no runtime or build logic impact.

Overview
Updates repository ownership mappings so profile-metrics-controller is no longer owned by @MetaMask/core-platform.

.github/CODEOWNERS and teams.json now assign ownership to the Mobile and Extension Platform teams, including adding codeowner entries for the package’s package.json and CHANGELOG.md.

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[Gudahtt]

LGTM!