fix(launch): fix env handling and node_selector handling

[KyleGoyette]

Fixes WB-11685
Fixes #NNNN

Description

• fixes nodeSelector handling

"node_selector": {"<label-name>": "<label-value"}

• fixes env handling to be canonical for kubernetes

"env": [{"name": "ENV_NAME", "value": <value>}]

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 #4555 (74548b0) into main (9742d22) will increase coverage by 0.10%.
The diff coverage is 100.00%.

❗ Current head 74548b0 differs from pull request most recent head 0014b40. Consider uploading reports for the commit 0014b40 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4555      +/-   ##
==========================================
+ Coverage   83.00%   83.11%   +0.10%     
==========================================
  Files         267      267              
  Lines       33768    33739      -29     
==========================================
+ Hits        28029    28041      +12     
+ Misses       5739     5698      -41     

Flag	Coverage Δ
functest	55.84% <0.00%> (+0.06%)	⬆️
unittest	73.47% <100.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
wandb/sdk/launch/runner/kubernetes.py	88.75% <100.00%> (ø)
wandb/sdk/internal/internal_api.py	89.79% <0.00%> (-0.26%)	⬇️
wandb/apis/public.py	81.87% <0.00%> (ø)
wandb/sdk/wandb_init.py	85.63% <0.00%> (ø)
wandb/sdk/launch/launch_add.py	100.00% <0.00%> (ø)
wandb/integration/gym/__init__.py	0.00% <0.00%> (ø)
wandb/integration/tensorboard/monkeypatch.py	91.35% <0.00%> (ø)
wandb/cli/cli.py	69.49% <0.00%> (+0.09%)	⬆️
wandb/sdk/wandb_setup.py	88.94% <0.00%> (+0.50%)	⬆️
wandb/sdk/internal/file_stream.py	89.86% <0.00%> (+1.01%)	⬆️
... and 5 more