🐞 fix: shasum in blobfuse-proxy installer for Flatcar, fix PATH in blobfuse-proxy.service

[t-lo]

/kind bug

What this PR does / why we need it:

The blobfuse-proxy installer script used with Flatcar, install-proxy-rhcos.sh, uses sha256sum to check whether blobfuse binaries need to be (re-)installed. If the checksum of blobfuse2 on the host and blobfuse2 shipped with the container differ, the host blobfuse2 is replaced.

However, for Flatcar, we use a custom name for the blobfuse2 binary on the host ("blobfuse2.bin") and ship a wrapper script named "blobfuse2" to update the linker path for blobfuse2. The shasum check did not account for this and inadvertently generated a checksum for the wrapper script instead of the actual binary.

Additionally, it fixes an issue introduced with the original Flatcar support PR in 0f30780, which modifies the PATH environment variable correctly for blobfuse-proxy/blobfuse-proxy.service but did not actually commit those changes to the service unit file.

This PR fixes both.

Pre-built container images for testing are available at: https://github.com/flatcar-hub/blob-csi-driver/pkgs/container/blob-csi

Backports to release branches:

• [release-1.27]🐞 fix: shasum in blobfuse-proxy installer for Flatcar, fix PATH in blobfuse-proxy.service #2217
• [release-1.26]🐞 fix: shasum in blobfuse-proxy installer for Flatcar, fix PATH in blobfuse-proxy.service #2218

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[andyzhangx]

/ok-to-test