CBG-5213 support dropping rosmar buckets

[torcolvin]

• Create CouchbaseCloud.drop_bucket function since this might be a Sync Gateway operation or a server operation
• Change the behavior when creating the database to make sure all databases that are backed by a given bucket are actually gone. If you had multiple databases on the same bucket using different collections, then dropping all of them is necessary to avoid issues creating a database if the new databases targets different collections than the dropped one.
• Add special rosmar option to sync gateway config support dropping rosmar buckets
• Make sure to stop sync gateway if it was already running

Testing done:

uv run environment/local/start_local.py --build-testserver 4.0.3
uv run environment/local/run_sync_gateway.py --server rosmar --start
uv run pytest --config environment/local/rosmar_config.json tests/dev_e2e 

And with Couchbase Server:

uv run environment/local/run_sync_gateway.py --server cbs --start
uv run pytest --config environment/local/cbs_config.json tests/dev_e2e 

[borrrden]

Is it? I don't see anywhere that it is consulted....

[torcolvin]

This is part of a subsequent PR, and the code was buggy so I removed it.

[borrrden]

wait_for_deleted looks suspicious to me...

[vipbhardwaj]

LGTM 👍🏻

[Copilot]

Pull request overview

This PR adds support for cleaning up Rosmar-backed buckets/databases during dataset setup, so local and e2e runs can reliably recreate Sync Gateway databases even when prior runs left state behind.

Changes:

• Added CouchbaseCloud.drop_bucket() to abstract bucket deletion across Couchbase Server vs Rosmar.
• Updated dataset (re)configuration flow to drop the backing bucket and wait until no databases reference it before recreating.
• Enabled Rosmar bucket management in the local Sync Gateway config and ensured local run_sync_gateway.py restarts cleanly.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Adds tenacity to the resolved dependency set.
pyproject.toml	Adds tenacity==9.1.4 as a direct dependency.
environment/local/sync_gateway_config/basic_sync_gateway_rosmar.json	Enables unsupported.rosmar_bucket_management to allow Rosmar bucket deletion.
environment/local/run_sync_gateway.py	Stops any existing local Sync Gateway process before starting a new one.
client/src/cbltest/api/syncgateway.py	Adds wait_for_no_databases() with retry logic; adjusts logging import/level.
client/src/cbltest/api/cloud.py	Introduces drop_bucket() and uses it during dataset reconfiguration on HTTP 412.

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[borrrden]

Probably just fix this tiny thing before merging