[text-auditor] Batch fix clear untracked typos in CI runtime messages and CEF outcome text

## Text Improvements

The following user-facing text issues were verified in-repo and appear untracked by current open `[text-auditor]` issues. Each is a low-effort correction.

### 1. `changset` typo in CI/runtime script output (4 occurrences)

**Why:** Clear spelling error in user-visible script messages.

- **File:** `.buildkite/scripts/trigger_integrations_in_parallel.sh` (line 30)
**Current text:** `Missing "from" changset`
**Suggested fix:** `Missing "from" changeset`
- **File:** `.buildkite/scripts/trigger_integrations_in_parallel.sh` (line 35)
**Current text:** `Missing "to" changset`
**Suggested fix:** `Missing "to" changeset`
- **File:** `.buildkite/scripts/test_integrations_with_serverless.sh` (line 67)
**Current text:** `Missing "from" changset`
**Suggested fix:** `Missing "from" changeset`
- **File:** `.buildkite/scripts/test_integrations_with_serverless.sh` (line 72)
**Current text:** `Missing "to" changset`
**Suggested fix:** `Missing "to" changeset`

**Completeness search used:** `\bchangset\b` (4 verified in-scope occurrences)

### 2. Grammar error in commit validation message

**Why:** Clear grammatical error in a user-facing annotated error.

- **File:** `.buildkite/scripts/backport_branch.sh` (line 287)
**Current text:** `The entered commit hasn't found in the **\$\{SOURCE_BRANCH}** branch`
**Suggested fix:** `The entered commit was not found in the **\$\{SOURCE_BRANCH}** branch`

**Completeness search used:** `hasn't found` (1 verified in-scope occurrence)

### 3. `sucess` typo family in CEF outcome descriptions (8 occurrences)

**Why:** Clear typo in user-facing field descriptions and corresponding package docs.

- **File:** `packages/cef/data_stream/log/fields/fields.yml` (line 99)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cef/data_stream/log/fields/fields.yml` (line 121)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cyberark_pta/data_stream/events/fields/cef.yml` (line 154)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cyberark_pta/data_stream/events/fields/cef.yml` (line 157)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cef/docs/README.md` (line 419)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cef/docs/README.md` (line 427)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cyberark_pta/docs/README.md` (line 177)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`
- **File:** `packages/cyberark_pta/docs/README.md` (line 185)
**Current text:** `Outcome of the event (e.g. sucess, failure, or attempt) (ArcSight).`
**Suggested fix:** `Outcome of the event (e.g. success, failure, or attempt) (ArcSight).`

**Completeness search used:** `\bsucess\b` (8 verified in-scope occurrences)

## Suggested Actions

- [x] Replace `changset` with `changeset` in both Buildkite scripts.
- [x] Update the backport error message grammar to `was not found`.
- [ ] Replace `sucess` with `success` across all listed CEF field/docs occurrences.

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[What is this?](https://ela.st/github-ai-tools) | [From workflow: Text Auditor](https://github.com/elastic/integrations/actions/runs/25794492283)

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> - [x] expires on May 20, 2026, 11:02 AM UTC