DYN-6774 cherry pick [DYN-6621] so that splash screen close works.

[mjkkirschner]

Purpose

splash screen web app calls a new method that is missing in 2.19.5 - cherry pick the PR that introduced it from master.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

[mjkkirschner]

@QilongTang @sm6srw all the geometry and viz tests are failing on this 2.19.5 build, I am assuming this is because we are installing 230 only on pullRequestvalidation job - what do we install on master-15 complete install test job?

This build only supports 229 and 228.5 :(

[QilongTang]

@QilongTang @sm6srw all the geometry and viz tests are failing on this 2.19.5 build, I am assuming this is because we are installing 230 only on pullRequestvalidation job - what do we install on master-15 complete install test job?

This build only supports 229 and 228.5 :(

I triggered a new 2.19.5 build today and it passed so master-15 is for sure good to run all the tests. I will merge and trigger a build for you