Enable Cypress E2E tests login to Dashboard URL with devFeatureFlags

[manosnoam]

https://issues.redhat.com/browse/RHOAIENG-16164

Description

• Pass query parameters (e.g devFeatureFlags) if the relative url is '/'.
• Login should override the user/password values (instead of append).

How Has This Been Tested?

All Cypress E2E tests were run using Jenkins on a real cluster (dashboard-e2e):

Test Impact

This PR enables us to run E2E on ODH Dashboard URL that includes devFeatureFlags in the query parameters.
To use, update your ODH_DASHBOARD_URL with the desired devFeatureFlags, in the Cypress variables file (frontend/src/__tests__/cypress/test-variables.yml), for example:
ODH_DASHBOARD_URL: https://odh-dashboard-opendatahub.apps.your-server.domain.com?devFeatureFlags=true

Request review criteria:

Self checklist (all need to be checked):

• [ x] The developer has manually tested the changes and verified that the changes work
• [ x] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [ x] The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

After the PR is posted & before it merges:

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (6e4cf62) to head (fee8def).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage   85.33%   85.33%           
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  Files        1354     1354           
  Lines       31110    31110           
  Branches     8687     8687           
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  Hits        26547    26547           
  Misses       4563     4563           

see 7 files with indirect coverage changes

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[manosnoam]

/retest

[openshift-ci]

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