message: Add fish support to install.sh
  I recently installed Fluvio from the online installer, but I felt left out when it came time to adding the bindir to my path.
  The first commit is the important one, the others just clean the output up slightly, now there are 3 variants.
diff: ## Platform Version 0.9.27 - UNRELEASED
  * Support installing clusters on Google Kubernetes Engine ([#2364](https://github.com/infinyon/fluvio/issues/2364))
  * Make Zig Install more reliable ([#2388](https://github.com/infinyon/fluvio/issues/2388s))
  +* Add path setting hint for fish shell in install script ([#2389](https://github.com/infinyon/fluvio/pull/2389))
  ## Platform Version 0.9.26 - 2022-05-10
  * Increase default `STORAGE_MAX_BATCH_SIZE` ([#2342](https://github.com/infinyon/fluvio/issues/2342))
  