refactor: Update Header and convert Header Story

[brianacnguyen]

Description

• Renamed Header to HeaderBase to align with Figma (link)
• Moved padding from HeaderBase to BottomSheetHeader
• Converted story to v6.5
• Updated tests

Screenshots/Recordings

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained:
  • What problem this PR is solving.
  • How this problem was solved.
  • How reviewers can test my changes.
• I’ve indicated what issue this PR is linked to: Fixes #???
• I’ve included tests if applicable.
• I’ve documented any added code.
• I’ve applied the right labels on the PR (see labeling guidelines).
• I’ve properly set the pull request status:
  • In case it's not yet "ready for review", I've set it to "draft".
  • In case it's "ready for review", I've changed it from "draft" to "non-draft".

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

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[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (7f46d2b) 34.85% compared to head (f605bca) 34.85%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7326   +/-   ##
=======================================
  Coverage   34.85%   34.85%           
=======================================
  Files        1027     1027           
  Lines       27423    27423           
  Branches     2267     2267           
=======================================
  Hits         9558     9558           
  Misses      17355    17355           
  Partials      510      510           

Files	Coverage Δ
...eets/BottomSheetHeader/BottomSheetHeader.styles.ts	100.00% <ø> (ø)
...ttomSheets/BottomSheetHeader/BottomSheetHeader.tsx	60.00% <ø> (ø)
...rary/components/HeaderBase/HeaderBase.constants.ts	100.00% <100.00%> (ø)
...library/components/HeaderBase/HeaderBase.styles.ts	57.14% <100.00%> (ø)
...onent-library/components/HeaderBase/HeaderBase.tsx	100.00% <100.00%> (ø)
...brary/components/HeaderBase/HeaderBase.stories.tsx	0.00% <0.00%> (ø)

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[georgewrmarshall]

LGTM! A couple non-blocking comments

Do we want to add any more example stories here and or controls?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

69.0% Coverage
0.0% Duplication