feat: adding applyPathContent and applyFiles for supporting autofix f…

[rpapani]

Autofix flows are currently using patch content stored in the suggestion or patch files, not the actual patch, so added the following support

• Adds two new public methods to CloudManagerClient — applyPatchContent for applying patches from in-memory strings (no S3 download) and applyFiles for writing files directly to a clone and committing. These support autofix workflows where the patch content or file data is already available in memory.
• Internally, the three apply methods (applyPatch, applyPatchContent, applyFiles) now share a single #applyChanges orchestration path that configures git identity, checks out the branch, runs the caller's apply callback, and optionally stages + commits.

Required for https://github.com/adobe/spacecat-autofix-worker/pull/445