tests/lib/timespec_util: Skip two tests by now

[aescolar]

These two (sub)tests assume the system tick period divides evenly all time interval values being tested, but this is not the case in general, and when it is not, these tests fail.

Let's skip these 2 tests by now so we can release without a broken CI, and do not block other development while the tests themselves are being fixed.

Note that this happens at least for the majority of Nordic devices, and as such these tests fail in Nordic simulation in CI.

Mitigates #92158

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[aescolar]

@cfriedt thanks for looking into #92158. After closing #92255 we are left without a practical alternative for 4.2 (as we are passed rc2). If you don't mind, let's disable these two tests by now, so we don't block other development until some other fix is ready.

[cfriedt]

@cfriedt thanks for looking into #92158. After closing #92255 we are left without a practical alternative for 4.2 (as we are passed rc2). If you don't mind, let's disable these two tests by now, so we don't block other development until some other fix is ready.

@aescolar - another fix is ready (#92709) as mentioned in #92255

In fact that fixes a few new bugs as well. I could file issues for them if you like.

[aescolar]

@aescolar - another fix is ready (#92709) as mentioned in #93255

Thanks @cfriedt . But I don't think that fix should go in at this point in the release cycle as it has significant changes and we are past rc2.
Just disabling these 2 tests by now eliminates the urgency from this issue unblocking others, so it can be worked on calmly.

[cfriedt]

#92709 will actually need to be merged anyway as it fixes additional issues.

I'll mark it a hotfix as well.

[aescolar]

@cfriedt note this is just a stop gap to unblock other PRs and not have a failing CI. This commit can certainly be reverted as part of #92709.

[aescolar]

@cfriedt would you be so kind as to unblock this PR so we can merge it as a stop gap?