Move BigQuery Agent Analytics docs to observability directory and update the plugin doc to v2

[haiyuan-eng-google]

No description provided.

[koverholt]

The PR title indicates a move to the plugins dir, but the doc is actually being moved to the observability directory. Do you want to move this to the plugins dir instead?

Also:

• For any moved pages, you'll need to add a redirect to the plugins.redirect config in https://github.com/google/adk-docs/blob/main/mkdocs.yml so that existing external links to the page are not broken
• You'll need to update the nav config in https://github.com/google/adk-docs/blob/main/mkdocs.yml for where this page should live in the left nav menu

[haiyuan-eng-google]

The PR title indicates a move to the plugins dir, but the doc is actually being moved to the observability directory. Do you want to move this to the plugins dir instead?

Also:

• For any moved pages, you'll need to add a redirect to the plugins.redirect config in https://github.com/google/adk-docs/blob/main/mkdocs.yml so that existing external links to the page are not broken
• You'll need to update the nav config in https://github.com/google/adk-docs/blob/main/mkdocs.yml for where this page should live in the left nav menu

Thanks for the review. @koverholt, actually this PR is aiming to moving the plugin into observability directory. Update the title also update the mkdocs.yml. Please take another look, thanks

[koverholt]

Thanks for the fixes. I didn't realize that there was a rewrite of the page since GitHub is not showing the diffs due to the file being moved. So we'll need to do a more thorough review of the content than I initially thought.

The biggest issue that I see is whether we want to include the full documentation on the older deprecated version in the second half of the page. Other than that, there are some rendering issues like the list in the "IAM Permissions" section is not rendering correctly and other consistency issues.

I left comments for these, and will also cc @joefernandez for review as well due to the scope of the changes.

[koverholt]

I don't think we want to include the full content of the old / deprecated version, but I will defer to @joefernandez on this.

[haiyuan-eng-google]

Thanks @koverholt , @joefernandez please provide guidance on this, thanks

[joefernandez]

@haiyuan-eng-google DO NOT preserve multiple versions of content in a single document; this practice is confusing to you users. Remove the deprecated content from this page. If you want to preserve it, consider adding it as a readme file that's kept with the source code and labeled appropriately, and if you want, link to that deprecated content from here.

[haiyuan-eng-google]

removed the deprecated contents, thanks

Change request resolved: removed deprecated content