Beta Branch revise gitenv_update routine to be smarter in 123.09beta01

revise gitenv_update routine to be smarter in 123.09beta01

- gitenv_update function is used to detect if the current github.com hosted directory changes via checking a file hosted on current github.com repository for centmin mod branch. This allows automated updates of users local git cloned /usr/local/src/centminmod directory. So in future if centmin mod official github.com repo changes name or location, I can update that file hosted on old repo and local centmin.sh menu option runs can detect the changed official centmin mod github repo name/location and automatically update /usr/local/src/centminmod locally to do a fresh git clone from the new location.
- this update improves the gitenv_update function to be smarter in case of network connectivity failures which accidentally trigger the automatic update and local refresh of local user's /usr/local/src/centminmod directory. When network connectivity issues happen, failure to properly read the github.com hosted file, triggers refresh of local user's /usr/local/src/centminmod directory which involves removing /usr/local/src/centminmod directory and doing a fresh git clone. But in cases of network connectivity issues, the git clone fails but the local user's /usr/local/src/centminmod directory has already been removed so you end up with local user's /usr/local/src/centminmod directory being missing https://community.centminmod.com/threads/centminmod-seems-to-have-disappeared.16666/.
- this update has a smarter check routine for this so that before removing /usr/local/src/centminmod, will move it to /usr/local/src/centminmod-automoved and then do fresh git clone creation of /usr/local/src/centminmod directory. Then check if git clone was successful before removing /usr/local/src/centminmod-automoved. If git clone fails for reasons like above, restore previous /usr/local/src/centminmod-automoved directory to /usr/local/src/centminmod.

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01

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