feat(roles): add only_governance_admin in roles internal trait

[noa-starkware]

Note

Adds only_governance_admin internal guard and introduces ONLY_GOVERNANCE_ADMIN error variant/message.

• Roles:
  • Add only_governance_admin check in roles.cairo internal trait to assert caller is GOVERNANCE_ADMIN.
• Errors:
  • Add ONLY_GOVERNANCE_ADMIN to AccessErrors with description "ONLY_GOVERNANCE_ADMIN".

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
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Files with missing lines	Patch %	Lines
packages/utils/src/components/roles/errors.cairo	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
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  Coverage        ?   89.26%           
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  Files           ?       43           
  Lines           ?     2479           
  Branches        ?        0           
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  Hits            ?     2213           
  Misses          ?      266           
  Partials        ?        0           

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