[RHOAIENG-5487] Initial "empty state" of home page

[jeff-phillips-18]

Closes: RHOAIENG-5487

Description

Adds an initial Home page for the dashboard hidden behind a feature flag. The feature flag is set to disable the page and it will not be shown until/unless it is enabled.

Screen shot

How Has This Been Tested?

Tested manually by turning on/off the disableHome flag.

Test Impact

Added e2e test to verify the feature flag is working correctly.

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)
• Included any necessary screenshots or gifs if it was a UI change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[andrewballantyne]

Looks great on code front... one suggested change... I wonder if it's not better to do /enabled instead of /applications just to match the /explore. Thoughts?

Let me test it out to verify things.

[openshift-ci]

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