Add a Dev Console smoke test for Keycloak

[sberyozkin]

Also
Fixes #18853.

(please backport together with #17364 if #17364 is backported)

[sberyozkin]

It was debug in my original copy of a similar code but I changed it to error while I was looking at some PR problem and forgot to change it back

[sberyozkin]

Hmm, it tries to start a KC dev services container. I thought I disabled it, @mkouba, does the smoke test setup looks correct to you ?

[sberyozkin]

@mkouba I'm also not sure if I should go through all provider.html and also embedded.html and update all the references to various info properties with ?? even those inside the scripts/etc ? May be it is simpler to register them as null if devservices for KC are disabled ? It works though for now

[sberyozkin]

I've double checked it and on my laptop the container is not starting - though I had to update one unit test in integration-tests/devmode to ensure OIDC will not attempt to connect in a non-dev mode

[sberyozkin]

I've cancelled the build as I've realized I had to disable KC dev services for all the devmode tests - this is a problem with enabling by default - but at least there are only a few of these tests are there

[sberyozkin]

OK, it should be better now, I've disabled it for all the tests at the pom level

[sberyozkin]

@phillip-kruger thanks, will also wait for Martin to check

[sberyozkin]

Looks like Martin is off, so I'll merge it then, I've verified locally as well that no container is started; the templates fixes are necessary in any case and we can do more as needed (I've run through the main page in a quickstart - all seems fine for now); Martin - please let me know when you get a chance if something else has to be improved :-)