[docs-patrol] Document new deployment_modes.agentless.release manifest field

Recent code changes in the repository have introduced documentation drift. The following change needs corresponding documentation updates.

## Changes Requiring Documentation Updates

### 1. New `deployment_modes.agentless.release` field is not documented in contributor docs

**Commit(s):** [`3aafd0f03cc116885d2707bfa2c0244d561e93bd`](https://github.com/elastic/integrations/commit/3aafd0f03cc116885d2707bfa2c0244d561e93bd)

**What changed:**
- The commit introduces a new `deployment_modes.agentless.release` field (e.g. `release: beta`) across many package manifests.
- Representative diff: `packages/1password/manifest.yml` adds:
- `deployment_modes.agentless.release: beta`

**Documentation impact:**
- `docs/extend/manifest-spec.md` documents agentless properties (`enabled`, `is_default`, `organization`, `division`, `team`, `resources`) but does not include `release` in the `deployment_modes.agentless` section (around lines 200-244).
- `docs/extend/define-deployment-modes.md` shows the `agentless` example with only `enabled` (around lines 35-40) and has no `release` mention.
- As a result, contributors following current docs cannot discover or correctly understand the newly introduced field and its allowed values (`beta | ga`).

## Suggested Actions

- [ ] Update `docs/extend/manifest-spec.md` to add `deployment_modes.agentless.release` with valid values and semantics.
- [ ] Update `docs/extend/define-deployment-modes.md` examples to include `agentless.release` where appropriate.
- [ ] Cross-check any related manifest/deployment-mode docs for consistency with this new field.

> [!NOTE]
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> 🔒 Integrity filter blocked 205 items
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> The following items were blocked because they don't meet the GitHub integrity level.
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> - ... and 189 more items
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