fix(sdk): Update default order in api runs

[thanos-wandb]

Description

• Fixes WB-18848
• Fixes Runs returned by wandb.Api contain duplicates not present on the web app #6614

What does the PR do? Include a concise description of the PR contents.

Changes default order of api.runs() to ascending (+created_at) to fix the issue where duplicate runs will be returned in API response. This is happening when new runs are created during paginated requests.

• 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 75.86%. Comparing base (defdd0d) to head (516977b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7675      +/-   ##
==========================================
+ Coverage   74.26%   75.86%   +1.59%     
==========================================
  Files         500      500              
  Lines       55727    54121    -1606     
==========================================
- Hits        41388    41061     -327     
+ Misses      13931    12651    -1280     
- Partials      408      409       +1     

Flag	Coverage Δ
func	41.35% <ø> (+0.05%)	⬆️
system	63.51% <ø> (+0.03%)	⬆️
unit	56.37% <ø> (+1.00%)	⬆️

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Files	Coverage Δ
wandb/apis/public/api.py	85.15% <ø> (ø)

... and 105 files with indirect coverage changes