ALS launches two alr processes in the same file to find a project file and environment (alr --non-interactive printenv and alr --non-interactive show). It seems they unable to work properly.

To Reproduce

1. Unpack reproducer.tar.gz from ALS #1192. I used a docker container built by vscode to have a clean environment.
2. Change directory to no-code-navigation and run

   for J in `seq 1 10`; do alr -n show > /tmp/alr-$J.log 2>&1 & done; wait

3. For failed alr process you will see Exit 1. Check /tmp/alr-$J.log for their output

Expected Behavior
Generally speaking it would be nice to success all concurrent alr executions, but I see that it's probable hard to achieve and verify by CI/tests. So I'm going to change ALS to launch alr processes in a sequence.

alr version

alr version: 2.0.1

alr logs

'alr --non-interactive show' failed:
Warning: Could not completely remove /root/.local/share/alire/releases/xmlada_24.0.0_ae5a015b/alire/alire.toml.upstream
ERROR: file "/root/.local/share/alire/releases/xmlada_24.0.0_ae5a015b/alire/alire.toml.upstream" could not be deleted
ERROR: alr encountered an unexpected error, re-run with -d for details.
ERROR: error location: 0x6347e939877f ada__directories__delete_file at ???

'alr --non-interactive printenv' failed:
Warning: Could not completely remove /root/.local/share/alire/releases/xmlada_24.0.0_ae5a015b/alire/alire.toml.upstream
ERROR: file "/root/.local/share/alire/releases/xmlada_24.0.0_ae5a015b/alire/alire.toml.upstream" could not be deleted
ERROR: alr encountered an unexpected error, re-run with -d for details. ERROR: error location: 0x62f95b2fa77f ada__directories__delete_file at ???

'alr --non-interactive printenv' failed:
ERROR: file "alire" not found ERROR:
alr encountered an unexpected error, re-run with -d for details. ERROR: error location: 0x579f6a2450c9 ada__directories__rename at ???

Warning: Could not completely remove /root/.local/share/alire/releases/gnatcoll_24.0.0_11c512d1
Warning: Contents listing failed with code:  2
ERROR: Deployment of source archive gnatcoll-core-24.0.0.zip at https://github.com/adacore/gnatcoll-core/archive/v24.0.0/gnatcoll-core-24.0.0.zip with hash sha512:11c512d1b4adec34953bb4247c92d01a1333d6246a925317a5b3d2b30ff05f32246d6e7cfec12df243f4e58d4820e91ac506ff758e8856e527cb0674c1ee029a to /root/.local/share/alire/releases/gnatcoll_24.0.0_11c512d1 failed

Warning: Could not completely remove /root/.local/share/alire/releases/gnatcoll_24.0.0_11c512d1
ERROR: Deployment of source archive gnatcoll-core-24.0.0.zip at https://github.com/adacore/gnatcoll-core/archive/v24.0.0/gnatcoll-core-24.0.0.zip with hash sha512:11c512d1b4adec34953bb4247c92d01a1333d6246a925317a5b3d2b30ff05f32246d6e7cfec12df243f4e58d4820e91ac506ff758e8856e527cb0674c1ee029a to /root/.local/share/alire/releases/gnatcoll_24.0.0_11c512d1 failed