fix: make scripts executable again in benchmark workflow

[Imod7]

Description

This issue #1584 still persists with a different error now from the last PR (#1585) that was merged :

error: Your local changes to the following files would be overwritten by checkout:
	scripts/ci/benchmarks/generate_benchmark_result.sh
Please commit your changes or stash them before you switch branches.
Aborting
Error: Command 'git' failed with args '-c user.name=github-action-benchmark -c user.email=github@users.noreply.github.com -c http.https://github.com/.extraheader= switch gh-pages': error: Your local changes to the following files would be overwritten by checkout:

Root cause

The root cause was identified by @alvicsam
This PR changed the permissions of the two scripts found benchmark folder :

• generate_benchmark_result.sh
• push_benchmark_results.sh

Suggested solution

Based on the recommendation of @alvicsam the files were given executable rights again with :

chmod +x scripts/ci/benchmarks/generate_benchmark_result.sh
chmod +x scripts/ci/benchmarks/push_benchmark_results.sh

Additional Fix

Fix in semantic workflow since pull_request_target is not needed.