RUM-18937: Split Kotlin version for the buildscript classpath and for the runtime classpath

[0xnm]

What does this PR do?

This PR does the split of Kotlin versions: version for the build environment vs version for the SDK compile/runtime classpaths.

Having the same version is not possible, because due to the AGP/plugins compatibility we need to move build version up more often and at the same time we need to keep ABI/transitive dependencies compatibility for our customers.

This PR bumps Kotlin version in the build environment to 2.2.10, although AGP version is using Kotlin 2.3 stdlib, but having KGP version 2.3 brings more problems to address.

So far this PR is focusing just on renames and updating Kotlin build env version to the highest which "just works without many changes".

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[0xnm]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T15:07:33.255885Z	646d3ea	Manual request
🔒 Security Review	✅ Completed 2026-10-09T15:06:11.847403Z	646d3ea	Manual request

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[chatgpt-codex-connector]

🛡️ Codex Security Review · Automatically triggered

Security review completed. No security issues were found in this pull request.

Reviewed commit: 646d3eaf1a

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 646d3eaf1a

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[datadog-datadog-prod-us1-2]

✅ All CI checks and tests passed. Datadog automation helped this PR pass.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog retried 1 test - 1 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 71.78% (-0.05%)

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