Add documentation for the `tools` option in the various workflow files

[NlightNFotis]

Description

Documents the tools: input and its options for the various workflow files.

Companion PR to https://github.com/github/codeql-action/pull/2281

Fixes https://github.com/github/codeql-action/issues/1327

Merge / deployment checklist

• [x] Confirm this change is backwards compatible with existing workflows.
• [x] Confirm the readme has been updated if necessary.
• [x] Confirm the changelog has been updated if necessary.