Add context to sentinel upload failures.

[jmhobbs]

Adds useful information when a sentinel file check fails, which generally means there is a system outage.

Closes #1063

📦 Published PR as canary version: 11.13.1--canary.1094.11444006276.0

✨ Test out this PR locally via:

npm install [email protected]
# or 
yarn add [email protected]

[github-actions]

📦 Package Size: 5268 KB

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03% (target: -1.00%)	❌ 45.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6890d08)	8460	4652	54.99%
Head commit (f4d4a94)	8479 (+19)	4660 (+8)	54.96% (-0.03%)

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 (#1094)	20	9	45.00%

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 v11.13.0 🚀