ENG-14083: Add Azure Key Vault user account auth scheme

[ccampo133]

Description of the change

As title.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• Jira issue referenced in commit message and/or PR title

Testing

GOROOT=/usr/local/opt/go/libexec #gosetup
GOPATH=/Users/ccampo/go #gosetup
/usr/local/opt/go/libexec/bin/go test -c -o /Users/ccampo/Library/Caches/JetBrains/IntelliJIdea2024.1/tmp/GoLand/___1resource_test_go.test github.com/cyralinc/terraform-provider-cyral/cyral/internal/repository/useraccount #gosetup
/usr/local/opt/go/libexec/bin/go tool test2json -t /Users/ccampo/Library/Caches/JetBrains/IntelliJIdea2024.1/tmp/GoLand/___1resource_test_go.test -test.v -test.paniconexit0 -test.run ^\QTestAccRepositoryUserAccountResource\E$
=== RUN   TestAccRepositoryUserAccountResource
=== PAUSE TestAccRepositoryUserAccountResource
=== CONT  TestAccRepositoryUserAccountResource
--- PASS: TestAccRepositoryUserAccountResource (31.69s)
PASS

Process finished with the exit code 0

[wcmjunior]

Please update docs and add some tests for the new feature.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
45.0% Duplication on New Code

See analysis details on SonarCloud

[wcmjunior]

LGTM. Thanks!