feat(ci): install helm-docs directly instead of using whole brew setup

[hainenber]

feat(ci): install helm-docs directly instead of using whole brew setup

SUMMARY

I just noticed that we're using whole brew just to install a component used in pre-commit CI. We can definitely shorten this via go install.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Green CI as acceptance criterion.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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