Create inclusive-language tests

What does this MR do?

Creates three new tests for inclusive language, and links to them from the appropriate place in the style guide:

1. InclusionAbleism.yml - suggestion level
2. InclusionCultural.yml - warning level (explanation follows)
3. InclusionGender.yml - suggestion level

I bumped the InclusionCultural.yml test from suggestion to warning because it's only testing for the following words, and the blacklist / whitelist test was previously at the warning level in the SubstitutionWarning.yml test:

swap:
  blacklist(ed|ing)?: denylist
  whitelist(ed|ing)?: allowlist
  master: primary
  slave: secondary

Related issues

Closes technical-writing#120 (closed)

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.
• If you have Developer permissions or higher:
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Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

When applicable:

• Update the permissions table.
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• Add the product tier badge accordingly.
• Add GitLab's version history note(s).
• Add/update the feature flag section.

Review checklist

All reviewers can help ensure accuracy, clarity, completeness, and adherence to the Documentation Guidelines and Style Guide.

1. Primary Reviewer

• Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.

2. Technical Writer

• Technical writer review. If not requested for this MR, must be scheduled post-merge. To request for this MR, assign the writer listed for the applicable DevOps stage.
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  • Add twdoing when starting work on the MR.
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3. Maintainer

1. Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review.
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