[CI, CK examples] Disable time_kernel for CI tests and examples

[johannes-graner]

Proposed changes

CI test times are long, and it's unnecessary to time the kernels when running in CI since we only run for verification.
This PR disables the time_kernel parameter for three tests and all examples in old CK. Those examples are run as part of the CI test suite, and it's only the default argument to the examples that are changed, so they can still be manually run with kernel timing enabled for performance testing.

Checklist

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• I have added tests relevant to the introduced functionality, and the unit tests are passing locally
• I have added the test to REGRESSION_TESTS list defined at the top of CMakeLists.txt in tests/CMakeLists.txt, IF the test takes more than 30 seconds to run.
• I have added inline documentation which enables the maintainers with understanding the motivation
• I have removed the stale documentation which is no longer relevant after this pull request
• (If this change is user-facing) I have added release notes which provide the end users with a brief summary of the improvement from this pull request
• I have run clang-format on all changed files
• Any dependent changes have been merged

Discussion

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