[release/8.0-staging] Strip trailing slash from source dir for cmake4 #114906
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Backport of #114779 to release/8.0-staging
/cc @akoeplinger @am11
Customer Impact
When building with cmake 4.0 it doesn't like a trailing slash in the source dir argument. We tried to strip the slash already but due to a copy/paste mistake we never actually did it and it went unnoticed until now.
Regression
We never noticed that we didn't strip the slash. We'll hit this as soon as the infrastructure is updated to use cmake 4.0.
Testing
CI testing.
Risk
Low. We already have the same code in other parts of the build.