ci: add repo topics + remove usage_template from catalog manifest

[ocofaigh]

Description

• add repo topics
• remove usage_template from catalog manifest. DAs are not designed to be embedded into part of another DA solution, they are designed to be the top level solution and not called from any higher level. So in this PR, I am removing the usage_template from the DA manifest which means the DA will no long show the Embed code section in the UI:

Release required?

• [x] No release
• [ ] Patch release (x.x.X)
• [ ] Minor release (x.X.x)
• [ ] Major release (X.x.x)

Release notes content

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Checklist for reviewers

• [ ] If relevant, a test for the change is included or updated with this PR.
• [ ] If relevant, documentation for the change is included or updated with this PR.

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[ocofaigh]

/run pipeline

[surajsbharadwaj]

/run pipeline