kernelci-pipeline: Remove patch file for staging TOML

[JenySadadia]

The pipeline running on staging instance used to use staging.kernelci.org.toml file for the configurations. The patch file kernelci-deploy/patches/kernelci-pipeline/staging.kernelci.org/0001-STAGING-config-staging.kernelci.org.toml-add-file-fo.patch was being used to maintain the TOML file.
We are using staging.kernelci.org.secrets.toml atm on the staging instance. Hence, we can consider removing the patch file and writing a new one for the currently used TOML file or think about other ways to maintain it.

[JenySadadia]

Some discussion has been done on this on #99