Use null-aware elements in dev/devicelab/lib/integration_tests.dart

[lukluca]

Description

Adopts null-aware element syntax (?x) in dev/devicelab/lib/integration_tests.dart, replacing 2 instances of the verbose if (x != null) x! pattern in the integration_tests file.

Part of #172188

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [AI contribution guidelines] and understand my responsibilities, or I am not using AI tools.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
• I signed the [CLA].
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is [test-exempt].
• I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
• All existing and new tests are passing.

[gemini-code-assist]

Code Review

This pull request modifies the env map in dev/devicelab/lib/tasks/integration_tests.dart by using the null-aware spread operator for environment and changing the assignment of FLUTTER_ADB_PATH. No review comments were provided, and there is no feedback to report.

[jmagman]

I added platform-android since integration_tests doesn't have a clear owner and this is adb related.

[AbdeMohlbi]

Please don't merge with head again, let the tests run

[reidbaker]

Thank you for your contribution! Because of the volume of PRs we receive, we require that new contributors use our checklist to guide them through critical steps in creating a Flutter PR. This PR's description is missing that checklist, so it is being marked as a Draft.

Please edit the PR description to add the checklist, then ensure that you have completed all of the steps. Once you've done that, please mark the PR as ready for review.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[gemini-code-assist]

Code Review

This pull request updates the initialization of the env map in dev/devicelab/lib/tasks/integration_tests.dart by using the null-aware spread operator ...? for the environment variable and modifying the assignment of 'FLUTTER_ADB_PATH'. There are no review comments, so I have no feedback to provide.