[Keycloak] Add Support of Dashboard

[mohitjha-elastic]

Proposed Commit Message

keycloak: add support of overview dashboard.

Currently, the integration does not include the support of dashboard hence added overview dashboard
in the integration to get better visualization of the data.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

Clone integrations repo.
Install the elastic package locally.
Start the elastic stack using the elastic package.
Move to integrations/packages/keycloak directory.
Run the following command to run tests.
elastic-package test -v

Related issues

• Part of SSI Integration: Missing Dashboard #13702
• Part of Security Integrations | Missing Dashboards #3102

Screenshots

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

Package keycloak 👍(0) 💚(0) 💔(1)

Expand to view

Data stream	Previous EPS	New EPS	Diff (%)	Result
log	2590.67	886.52	-1704.15 (-65.78%)	💔

To see the full report comment with /test benchmark fullreport

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
98.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 954040b

cc @mohitjha-elastic