POD-758: Allow user to specify fleet version

[bkneis]

WIP!! This PR introduces an additional IDE option for fleet to indicate which version to install.

➜  devpod git:(POD-758/specify-fleet-version) ✗ ./devpod-cli ide options fleet
  
         NAME      |          DESCRIPTION           |                                                   DEFAULT                                                    | VALUE  
  -----------------+--------------------------------+--------------------------------------------------------------------------------------------------------------+--------
    DOWNLOAD_AMD64 | The download url for the amd64 | https://download.jetbrains.com/product?code=FLL&release.type=preview&release.type=eap&platform=linux_x64     |        
                   | install script                 |                                                                                                              |        
    DOWNLOAD_ARM64 | The download url for the arm64 | https://download.jetbrains.com/product?code=FLL&release.type=preview&release.type=eap&platform=linux_aarch64 |        
                   | install script                 |                                                                                                              |        
    VERSION        | The version of fleet to        | latest                                                                                                       |        
                   | install                        |                                                                                                              |        

We then check this value and if latest is not specified we use the CLI option of fleet launcher to indicate the version of fleet to install.

Notes this PR is not ready to merge until I install jetbrains on my machine and test with fleet