Check index deprecation warnings on system tests

[jsoriano]

Use the migration APIs to get deprecation warnings for the data stream under test.

Fixes #2342.

[jsoriano]

test integrations

[elastic-vault-github-plugin-prod]

Created or updated PR in integrations repository to test this version. Check elastic/integrations#12434

[jsoriano]

Many packages fail if we enable these checks from 8.17.0: https://buildkite.com/elastic/integrations/builds/20850

Configuring source mode in mappings is deprecated and will be removed in future versions. Use [index.mapping.source.mode] index setting instead. 

It looks like an issue in the stack, so probably we should filter out this warning.

[kpollich]

This should be fixed by elastic/kibana#207133 which will make 8.17.2

[jsoriano]

Tested in 8.18.0-SNAPSHOT and it is effectively fixed: https://buildkite.com/elastic/integrations/builds/20866

So I will filter out 8.17.0 and 8.17.1 from these warnings.

[jsoriano]

I haven't found any test case to add, the only warning I have seen is the one we are going to ignore.
Though as it is now, it would have helped to earlier detect this.

I am opening for review. Let me know if you have an idea about how to produce a deprecation warning with a package.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: bff482d

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• 💔 Build #4719 failed a372e70

cc @jsoriano