fix(artifacts): use run project for use_artifact

[ibindlish]

Description

• Fixes WB-NNNNN
• Fixes #NNNN

Similar to entity envvar issue fixed in #6843

Root Cause:
Run.use_artifact() creates a client and passes the run's entity & project to its settings: code
Api.use_artifact() overrides the entity & project in its settings with values from env variables: code

Repro:
Create a team with 2 users dev-team
Create a restricted project 'testing-use-artifact' and add just user1;
Log artifact dev-team/testing-use-artifact/artifact:v0

Log in as user2 from dev-team

Run the following code as user2:

os.environ["WANDB_PROJECT"] = "testing-use-artifact"

ENTITY = "dev-team"
PROJECT = "testing"
ARTIFACT = "artifact"

run = wandb.init(entity=ENTITY, project=PROJECT)
artifact = run.use_artifact("dev-team/testing/artifact:v0")
print(artifact.id)
run.finish()

Before:

wandb: ERROR Error while calling W&B API: failed to find run testing-use-artifact/tbwmxqpl (<Response [404]>)
wandb: ERROR Permission denied to access dev-team/testing/tbwmxqpl

After: No error.

• I updated CHANGELOG.md, or it's not applicable

Testing

How was this PR tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.85%. Comparing base (6bc85c2) to head (ec88f7e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7701      +/-   ##
==========================================
+ Coverage   72.81%   75.85%   +3.03%     
==========================================
  Files         491      500       +9     
  Lines       55565    54179    -1386     
==========================================
+ Hits        40462    41096     +634     
+ Misses      14681    12670    -2011     
+ Partials      422      413       -9     

Flag	Coverage Δ
func	41.34% <ø> (+0.02%)	⬆️
system	63.52% <ø> (+0.01%)	⬆️
unit	56.31% <ø> (+5.39%)	⬆️

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

Files	Coverage Δ
wandb/sdk/wandb_run.py	88.46% <ø> (ø)

... and 116 files with indirect coverage changes