Use lombok Getter to simplify openmetadata-ui/*.java files

[mithmatt]

Describe your changes :

See #2972

• Use Getter for all the objects
• Remove unused functions

Type of change :

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Frontend Preview (Screenshots) :

For frontend related change, please link screenshots of your changes preview! Optional for backend related changes.

Checklist:

• I have read the CONTRIBUTING document.
• I have performed a self-review of my own.
• I have tagged my reviewers below.
• I have commented on my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests passed.

Reviewers

Frontend: @shahsank3t, @darth-coder00, @Sachin-chaurasiya

[github-actions]

The Java checkstyle failed.

Please run mvn googleformatter:format@reformat-sources in the root of your repository and commit the changes to this PR.
You can also use pre-commit to automate the Java code formatting.

You can install the pre-commit hooks with make install_test precommit_install.

[mithmatt]

[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ openmetadata-ui ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 43 source files to /Users/matt/Documents/projects/open-metadata/OpenMetadata/openmetadata-ui/target/test-classes
[WARNING] /Users/matt/Documents/projects/open-metadata/OpenMetadata/openmetadata-ui/src/test/java/org/openmetadata/catalog/selenium/events/Events.java: /Users/matt/Documents/projects/open-metadata/OpenMetadata/openmetadata-ui/src/test/java/org/openmetadata/catalog/selenium/events/Events.java uses or overrides a deprecated API.
[WARNING] /Users/matt/Documents/projects/open-metadata/OpenMetadata/openmetadata-ui/src/test/java/org/openmetadata/catalog/selenium/events/Events.java: Recompile with -Xlint:deprecation for details.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  10.639 s
[INFO] Finished at: 2022-02-24T03:14:48-08:00
[INFO] ------------------------------------------------------------------------

[sonarcloud]

[catalog] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication