VAULT-30091: add local alias to activity export output

[ccapurso]

Description

RFC: VLT-324 - Enhance Activity Export API with Identity Metadata

This PR adds expands upon https://github.com/hashicorp/vault-enterprise/pull/6287 and #28064 by adding LocalAlias to ActivityLogExportRecord to denote if an alias is local.

The activity test fixture files have been removed as they are no-longer used in CE tests.

VAULT-30091 - Specify if entity is local in export output
ENT PR: https://github.com/hashicorp/vault-enterprise/pull/6500

TODO only if you're a HashiCorp employee

• Backport Labels: If this PR is in the ENT repo and needs to be backported, backport
  to N, N-1, and N-2, using the backport/ent/x.x.x+ent labels. If this PR is in the CE repo, you should only backport to N, using the backport/x.x.x label, not the enterprise labels.
  • If this fixes a critical security vulnerability or severity 1 bug, it will also need to be backported to the current LTS versions of Vault. To ensure this, use all available enterprise labels.
• ENT Breakage: If this PR either 1) removes a public function OR 2) changes the signature
  of a public function, even if that change is in a CE file, double check that
  applying the patch for this PR to the ENT repo and running tests doesn't
  break any tests. Sometimes ENT only tests rely on public functions in CE
  files.
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  in the PR description, commit message, or branch name.
• RFC: If this change has an associated RFC, please link it in the description.
• ENT PR: If this change has an associated ENT PR, please link it in the
  description. Also, make sure the changelog is in this PR, not in your ENT PR.

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[divyaac]

Looks good1