Prepare release v0.3.0 - #90

Update COSI controller/sidecar from commit c2f6e65 to v0.2.2
(f75d475) and remove two patches that have been merged upstream:

- 89-reconciliation.diff: fix reconciliation logic for existing
  and deleted objects (PR #89)
- 90-bucket-name.diff: prefix bucket names with bucket- using
  UID only (PR #90)

Both patches were contributed by kvaps and included in the
upstream v0.2.2 release (2025-12-08).

Also remove git from Dockerfile dependencies as it was only
needed for applying patches.

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

…2261)

## What this PR does

Update COSI controller/sidecar from commit `c2f6e65` to upstream
release `v0.2.2` and remove two patches that have been merged:

- `89-reconciliation.diff` — fix reconciliation logic for existing
  and deleted objects (upstream PR #89)
- `90-bucket-name.diff` — prefix bucket names with `bucket-` using
  UID only (upstream PR #90)

Both were contributed by kvaps and included in the v0.2.2 release
(2025-12-08).

Also removes `git` from Dockerfile dependencies as it was only
needed for applying patches.

Note: `make image` needs to be run to rebuild the container image
and update `values.yaml` with the new tag/digest.

### Release note

```release-note
[objectstorage-controller] Update to v0.2.2, drop upstreamed patches
```


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Updated object storage controller build configuration to streamline
upstream component retrieval and image build process.
* Modified resource deletion handling so deletion flows are centralized
and consistently enforced across create/update events.
* Changed bucket naming scheme—buckets will no longer include the bucket
class name in their identifier and follow the simplified naming pattern.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->