Improve code coverage (indexer-azure)

All Submissions:

• [YES] I have added an explanation of what changes in this merge do and why we should include it?
• [NO] I have updated the documentation accordingly.
• [YES] I have added tests to cover my changes.
• [YES] All new and existing tests passed.
• [YES] My code follows the code style of this project.
• [NO] I ran lint checks locally prior to submission.

What is the current behavior?

No Unit Tests and zero code coverage for indexer-azure.

What is the new behavior?

Added Unit Tests to improve code coverage for indexer-azure

Does this introduce a breaking change?

• [NO]

cc: @kibattul @polavishnu @amaverma

Note

To exclude the Config classes from jacoco code coverage reports, add the following configuration in pom.xml for Jacoco plugin.

<configuration>
    <excludes>
        <exclude>org/opengroup/osdu/indexer/azure/*/*Config*</exclude>
    </excludes>
</configuration>