Add disableConnectionTypes feature flag

[emilys314]

https://issues.redhat.com/browse/RHOAIENG-10564

Description

Adds a new feature flag to the odhDashboardConfig for the upcoming work on the custom data connection types feature.

How Has This Been Tested?

• Pushed the updated CRD to my personal cluster with the new flags and verified the flag being received in network requests.
• Running the frontend and backend locally, got the new flag saw it in the browser console.
• turned the flag to true and false to verify it switches
  

Test Impact

• no tests added, not really much to test yet? other feature flags don't have tests either

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)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX 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

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[lucferbux]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jeff-phillips-18, lucferbux

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [lucferbux]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment