Fix most offenses for RSpec/InvalidFeatureCategory

What does this MR do and why?

Some highlights:

• team_planing -> team_planning
• snippets -> source_code_management
• project_management -> team_planning
• import -> importers

!111053 (merged) helped to fix some typos 💘

Contributes to #381882 (closed).

Out of scope

• Changes for specs tagged as not_owned. See #381882 (comment 1242336478).
• False positives. See #381882 (comment 1265865125) and !111118 (merged).

How to set up and validate locally

rake rubocop:todo:generate[RSpec/InvalidFeatureCategory]

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.