[docs-patrol] Update CI docs for schedule changes and skip-CI file matching

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

## Changes Requiring Documentation Updates

### 1. Scheduled CI behavior changed, but `docs/ci_pipelines.md` still describes nightly + weekly runs

**Commit(s):**
- https://github.com/elastic/integrations/commit/bebb005b5848848aaef614b653d22c5e7af48af1

**What changed:**
- `catalog-info.yaml` changed daily schedules to weekdays only (`cronline: "30 0 * 1-5"`, `"30 1 * 1-5"`, `"30 3 * 1-5"`, `"30 4 * 1-5"`) at `catalog-info.yaml` lines 186, 194, 200, 206.
- Weekly schedule entries were commented out in `catalog-info.yaml` lines 259-265 (`# NOTE: Stop running weekly for now`).

**Documentation impact:**
- `docs/ci_pipelines.md` still states:
- “pipeline running every night” for schedule-daily (`docs/ci_pipelines.md` line 9)
- “pipeline running once per week” for schedule-weekly (`docs/ci_pipelines.md` line 10)
- “Every night ... daily job” (`docs/ci_pipelines.md` line 149)
- active weekly section (“Every week it is configured to run...”) (`docs/ci_pipelines.md` lines 196-202)
- These statements are now inaccurate and should be updated to reflect weekday-only daily schedules and paused weekly scheduling.

### 2. PR CI package-selection docs are stale after expanded skip patterns

**Commit(s):**
- https://github.com/elastic/integrations/commit/989678548f4a95e82eb7968fe8d9f7004a7cd223

**What changed:**
- Expanded non-package skip patterns in `.buildkite/pull-requests.json` `skip_ci_on_only_changed` (lines 16-35), including `docs/`, `README.md`, `CONTRIBUTING.md`, `.mergify.yml`, `catalog-info.yaml`, etc.
- Matching pattern list in `.buildkite/scripts/common.sh` `non_package_patterns` was expanded (lines 765-788).

**Documentation impact:**
- `docs/ci_pipelines.md` still says that if files outside `packages` are changed, all packages are tested, with only narrow exceptions (`.github/CODEOWNERS` or `.docs/`) (`docs/ci_pipelines.md` line 70).
- This no longer matches current behavior and should be updated with the broader exception set and current path matching logic.

## Suggested Actions

- [ ] Update `docs/ci_pipelines.md` top-level pipeline descriptions and Daily/Weekly sections to reflect weekday-only daily schedules and currently disabled weekly schedules.
- [ ] Update `docs/ci_pipelines.md` Pull Request package-selection rules to match current skip patterns in `.buildkite/pull-requests.json` and `.buildkite/scripts/common.sh`.
- [ ] Replace stale examples (`.docs/`) with current paths (`docs/`) and list representative exclusions now treated as non-package changes.

> [!NOTE]
>
> 🔒 Integrity filter blocked 11 items
>
> The following items were blocked because they don't meet the GitHub integrity level.
>
> - [#6571](https://github.com/elastic/integrations/issues/6571) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#16894](https://github.com/elastic/integrations/issues/16894) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18591](https://github.com/elastic/integrations/pull/18591) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#17979](https://github.com/elastic/integrations/pull/17979) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#17506](https://github.com/elastic/integrations/pull/17506) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18662](https://github.com/elastic/integrations/pull/18662) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18744](https://github.com/elastic/integrations/pull/18744) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18671](https://github.com/elastic/integrations/pull/18671) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#16732](https://github.com/elastic/integrations/pull/16732) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18165](https://github.com/elastic/integrations/issues/18165) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18576](https://github.com/elastic/integrations/issues/18576) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
>
> To allow these resources, lower `min-integrity` in your GitHub frontmatter:
>
> ```yaml
> tools:
> github:
> min-integrity: approved # merged | approved | unapproved | none
> ```
>
>

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