feat: Storage Account - Simplified File Share RBAC assignment to use one less file & a more bicep-native deployment variant

[AlexanderSehr]

Description

Simplified Storage Account File Share RBAC assignment to use one less file & a more bicep-native deployment variant

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Pipeline

Type of Change

• Update to CI Environment or utilities (Non-module affecting changes)
• Azure Verified Module updates:
  • Bugfix containing backwards-compatible bug fixes, and I have NOT bumped the MAJOR or MINOR version in version.json:
    • Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
    • The bug was found by the module author, and no one has opened an issue to report it yet.
  • Feature update backwards compatible feature updates, and I have bumped the MINOR version in version.json.
  • Breaking changes and I have bumped the MAJOR version in version.json.
  • Update to documentation

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[AlexanderSehr]

Hey @ktremain,
just a small simplification regarding the fileShares RBAC workaround :)