Automatically extend the Dartium expiration date for test/coverage tasks

[greglittlefield-wf]

Problem

Dartium has hit its built-in expiration date, and cannot run Dart code properly unless the date is overridden using the DARTIUM_EXPIRATION_TIME environment variable.

dart-lang/sdk#33580

This causes tests and coverage to timeout inexplicably when running content-shell, and only with a popup warning when running in Dartium.

Solution

Automatically set this flag in relevant processes launched by dart_dev to work around this issue and prevent frustrating content-shell failures.

Testing:

• Run ddev test/ddev coverage in a terminal where DARTIUM_EXPIRATION_TIME is unset, and verify that tests pass

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[codecov-io]

Codecov Report

Merging #266 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #266   +/-   ##
=======================================
  Coverage   22.98%   22.98%           
=======================================
  Files           7        7           
  Lines         161      161           
=======================================
  Hits           37       37           
  Misses        124      124

Impacted Files	Coverage Δ
lib/src/util.dart	39.47% <ø> (ø)	⬆️
lib/src/task_process.dart	53.65% <100%> (ø)	⬆️

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[jayudey-wf]

QA +1

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • verified that w/ this change content_shell was able to load and run tests and then w/o this change content_shell just hung regarding the test and coverage task
• Security review (if required)
• Unit tests created/updated (n/a)
• All unit tests pass
• Rosie has run and reports properly the release the ticket will be included in
• Areas of regression noted

Merging into master.

[robbecker-wf]

+1 reminds me of