elastic / cloudbeat / 14131670707

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[8.x](backport #3143) cnvm: Delete old snapshots on startup (#3151)

cnvm: Delete old snapshots on startup (#3143)

### Summary of your changes

Change CNVM to add a background job cleaning up old snapshots.

The logic here is:
1. Background routine is started. Since the amount of leftover snapshots can be quite high (e.g. 40k in our account),  3 cleanup workers are used
2. `IterOwnedSnapshots()` is called which goes over all snapshots, returning an iterator. Snapshots are selected if:
    1. They are more than 48 hours old
    2. They have a tag with key "Name" and value starting with "elastic-vulnerability"
    3. They are "self-owned"
3. Cleanup returns. On context cancelled, no extra grace period is added so the process doesn't block restarts/shutdown.

### Screenshot/Data

Deleted 1178 snapshots from `2025-03-25T16:17:08.384Z` to `2025-03-25T16:20:19.504Z`

### Related Issues

Closes https://github.com/elastic/cloudbeat/issues/3105
Closes https://github.com/elastic/sdh-security-team/issues/1168

### Checklist
- [x] I have added tests that prove my fix is effective or that my feature works
- [x] I have added the necessary README/documentation (if appropriate)

#### Introducing a new rule?
No

(cherry picked from commit 8860b9d9c)

Co-authored-by: Orestis Floros <orestis.floros@elastic.co>

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