[roottest] convert to cmake meta/ROOT-7181 tests

[linev]

Like in cmsUnload, provide special runscript.C which loads commands and invoke them one by one.

Tests failing on most platforms with assert message from clang, to be investigated

[pcanal]

I am curious, why those changes?

[linev]

First of all, .so is not working on Windows.
And second - use of .L libjet_dictrflx requires changes of default macro path.
So I trying to load library with gSystem->Load.
Test perfectly works on my node, but fails on all CI nodes.
So I need to investigate further

[pcanal]

Like in cmsUnload, provide special runscript.C which loads commands and invoke them one by one.

If that PR is already open and/or merged, can we link it here?

[github-actions]

Test Results

    21 files      21 suites   3d 11h 7m 48s ⏱️
 3 571 tests  3 428 ✅  0 💤 143 ❌
73 238 runs  72 974 ✅ 17 💤 247 ❌

For more details on these failures, see this check.

Results for commit c061944.

♻️ This comment has been updated with latest results.

[linev]

Like in cmsUnload, provide special runscript.C which loads commands and invoke them one by one.

If that PR is already open and/or merged, can we link it here?

Change of cmsUnload is here: #19672
But they do not depend from each other.
In both tests instead of redirecting of standard input one just read text file line by line and executing ProcessLine