Account for configs when checking exitOnceUploaded in action

[codykaup]

Fixes #1128

In our Action, we default exitOnceUploaded to false which means any options set in a configuration are ignored. Instead, we can default it to undefined so things parse out later on (and account for config options).

Test runs with this branch:

• No config (waits for build): https://github.com/chromaui/chromatic-cli/actions/runs/12241546124/job/34146875208
• With config (doesn't wait for build): https://github.com/chromaui/chromatic-cli/actions/runs/12241558833/job/34146917373

📦 Published PR as canary version: 11.20.2--canary.1130.12263328287.0

✨ Test out this PR locally via:

npm install chromatic@11.20.2--canary.1130.12263328287.0
# or 
yarn add chromatic@11.20.2--canary.1130.12263328287.0

[github-actions]

📦 Package Size: 5448 KB
✅ Compared to main: 0 KB 383ecdd (5448 KB)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	❌ 0.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (383ecdd)	7298	5027	68.88%
Head commit (740951a)	7298 (+0)	5027 (+0)	68.88% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1130)	1	0	0.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[chromatic-ci-bot]

🚀 PR was released in v11.20.1 🚀