Bugfix: Updated Logger.setAsyncContext() behavior

[jongpie]

Core Unlocked Package Changes

• Updated the behavior of Logger.setAsyncContext() to only set the context the first time a non-null context value is provided
  • Previously, subsequent calls would overwrite the context value, which wasn't really the intended behavior - it's intended to be used to set context at the beginning of a transaction

Pipeline Changes

• Made some optimizations in build.yml so some steps don't run on draft PRs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.25%. Comparing base (1629291) to head (b1830e1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #770 +/- ## ======================================= Coverage 92.24% 92.25% ======================================= Files 74 74 Lines 7211 7216 +5 Branches 199 199 ======================================= + Hits 6652 6657 +5 Misses 531 531 Partials 28 28 ``` | [Flag](https://app.codecov.io/gh/jongpie/NebulaLogger/pull/770/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Gillespie) | Coverage Δ | | |---|---|---| | [Apex](https://app.codecov.io/gh/jongpie/NebulaLogger/pull/770/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Gillespie) | `94.24% <100.00%> (+<0.01%)` | :arrow_up: | | [LWC](https://app.codecov.io/gh/jongpie/NebulaLogger/pull/770/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Gillespie) | `83.26% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Gillespie#carryforward-flags-in-the-pull-request-comment) to find out more.

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[jamessimone]

Aw yeah!

[jongpie]

@jamessimone thanks again for reviewing this!