refactor(launch): remove unused attribute

[jamie-rasmussen]

Description

Removes an attribute that appears to be unused.

Testing

How was this PR tested?

Checklist

• Include reference to internal ticket "Fixes WB-NNNN" and/or GitHub issue "Fixes #NNNN" (if applicable)
• Ensure PR title compliance with the conventional commits standards

[codecov]

Codecov Report

Merging #4497 (e5ddc4d) into main (b96107d) will increase coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4497      +/-   ##
==========================================
+ Coverage   83.10%   83.14%   +0.04%     
==========================================
  Files         259      259              
  Lines       32980    32979       -1     
==========================================
+ Hits        27408    27421      +13     
+ Misses       5572     5558      -14     

Flag	Coverage Δ
functest	56.94% <ø> (+0.01%)	⬆️
unittest	73.33% <ø> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wandb/sdk/launch/_project_spec.py	93.01% <ø> (-0.03%)	⬇️
wandb/sdk/lib/sock_client.py	93.12% <0.00%> (-1.06%)	⬇️
wandb/sdk/service/server_sock.py	91.87% <0.00%> (-1.02%)	⬇️
wandb/sdk/lib/printer.py	88.60% <0.00%> (-0.64%)	⬇️
wandb/sdk/lib/git.py	79.01% <0.00%> (ø)
wandb/sdk/wandb_run.py	90.89% <0.00%> (ø)
wandb/sdk/lib/mailbox.py	93.49% <0.00%> (+0.34%)	⬆️
wandb/sdk/wandb_setup.py	88.94% <0.00%> (+0.50%)	⬆️
wandb/sdk/internal/internal_api.py	89.69% <0.00%> (+0.51%)	⬆️
wandb/sdk/interface/interface_shared.py	87.33% <0.00%> (+0.77%)	⬆️
... and 3 more

[KyleGoyette]

Drat, I how'd I miss this