Update Composer naming and add ManagedAirflow aliases

[VladaZakharova]

Update Google provider Composer naming to reflect the Managed Service for Apache Airflow rebrand.
Please, check https://docs.cloud.google.com/composer/docs.

This PR:

• updates the bug report issue template deployment option
• adds ManagedAirflow...Operator aliases for Composer operators
• updates Composer docs

The existing CloudComposer...Operator names will continue to work.
Continuation of #64257

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Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

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• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.

[VladaZakharova]

Hi @shahar1
I have updated the code according to your comment, can you please recheck? thanks

[shahar1]

@VladaZakharova Please fix static checks - once done and CI is green, it can be merged

[github-actions]

Backport failed to create: v3-2-test. View the failure log Run details

Note: As of Merging PRs targeted for Airflow 3.X
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.

In matter of doubt please ask in #release-management Slack channel.

Status	Branch	Result
❌	v3-2-test

You can attempt to backport this manually by running:

cherry_picker d984e0c v3-2-test

This should apply the commit to the v3-2-test branch and leave the commit in conflict state marking
the files that need manual conflict resolution.

After you have resolved the conflicts, you can continue the backport process by running:

cherry_picker --continue

If you don't have cherry-picker installed, see the installation guide.