Update Bitbucket authentication information

[MikeScheurwater]

Information update for n8n-io/n8n#20200

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Note

Updates Bitbucket credentials docs to use Atlassian email + scoped API token and lists required permission scopes.

• Docs:
  • Bitbucket credentials (docs/integrations/builtin/credentials/bitbucket.md):
    • Update supported auth to Atlassian email + scoped API token (replacing API username/app password).
    • Replace setup instructions to use Atlassian email and API token.
    • Rename permissions section to API token permissions; update link to API token permissions docs.
    • Add important scopes list: read:webhook:bitbucket, write:webhook:bitbucket, delete:webhook:bitbucket, read:repository:bitbucket, read:workspace:bitbucket.

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[github-actions]

Thanks @MikeScheurwater! We'll hold off on reviewing this until the PR is ready to go in the main repo.