Remove use-swift-blobstore ops file and OpenStack blobstore references

[WeiQuan0605]

Please take a moment to review the questions before submitting the PR

🚫 We only accept PRs to develop branch. If this is an exception, please specify why 🚫

WHAT is this change about?

fog-openstack is no longer supported by CAPI. Remove the Swift blobstore ops file, its example vars file, the standard_test operations entry, and all documentation references in operations/README.md and the OpenStack iaas-support guide.

What customer problem is being addressed? Use customer persona to define the problem e.g. Alana is unable to...

Cody (CF operator) can no longer deploy CF with a Swift blobstore because CAPI dropped fog-openstack support. Continuing to ship use-swift-blobstore.yml would provide a non-functional ops file that silently misconfigures the blobstore. This removes the dead configuration to prevent confusion and failed deployments.

Please provide any contextual information.

fog-openstack is no longer supported by cloud_controller_ng

Has a cf-deployment including this change passed cf-acceptance-tests?

• YES
• NO

Does this PR introduce a breaking change? Please take a moment to read through the examples before answering the question.

• YES - category 7: removes operations/use-swift-blobstore.yml from ./operations/.
• NO

Types of breaking changes:

1. causes app or operator downtime
2. increases VM footprint of cf-deployment - e.g. new jobs, new add ons, increases # of instances etc.
3. modifies, deletes or moves the name of a job or instance group in the main manifest
4. modifies the name or deletes a property of a job or instance group in the main manifest
5. changes the name of credentials in the main manifest
6. requires out-of-band manual intervention on the part of the operator
7. modifies the ops-file path, changes the type, changes the values or removes ops-files from the following folders
   • ./operations/ or ./operations/experimental
   • ./addons
   • ./backup-and-restore/

If you're promoting an experimental Ops-file (or removing one), Please follow the Ops-file workflows.

Ops files changes in the following folders are considered as NON BREAKING CHANGES
./community, ./example-vars-files, ./test

How should this change be described in cf-deployment release notes?

Removed use-swift-blobstore.yml ops file and associated vars file. Operators using OpenStack Swift as a blobstore should migrate to an alternative external blobstore, as fog-openstack support has been dropped.

Does this PR introduce a new BOSH release into the base cf-deployment.yml manifest or any ops-files?

• YES - please specify
• NO

Does this PR make a change to an experimental or GA'd feature/component?

• experimental feature/component
• GA'd feature/component

Please provide Acceptance Criteria for this change?

1. Verify operations/use-swift-blobstore.yml no longer exists in the repo.
2. Verify operations/example-vars-files/vars-use-swift-blobstore.yml no longer exists.
3. Verify operations/README.md no longer references use-swift-blobstore.yml.
4. Verify iaas-support/openstack/README.md no longer contains Swift blobstore instructions.
5. bosh deploy cf-deployment.yml -o operations/openstack.yml ... still works (Swift-specific section removed, base OpenStack deploy unaffected).

What is the level of urgency for publishing this change?

• Urgent - unblocks current or future work
• Slightly Less than Urgent

Tag your pair, your PM, and/or team!