Clean up violations of Dart lint "avoid_single_cascade_in_expression_statements". AVOID single cascade in expression statements.
Clean up violations of Dart lint "avoid_single_cascade_in_expression_statements".
AVOID single cascade in expression statements.

[Lint documentation](https://dart-lang.github.io/linter/lints/avoid_single_cascade_in_expression_statements)
[Dart lints discussion](http://g/dart-lints/Pn95rk2Uj28/HTz34tc9BgAJ)

More information: http://go/dart-trivial-lint-cleanup-lsc

Tested:
    tap_presubmit: http://test/OCL:354475262:BASE:354467909:1611926611261:809355d6
    Sample tests for this CL passed, but some tests failed during the TGP run. Test failures are believed to be unrelated to this CL
PiperOrigin-RevId: 354902189

dart-lang/mockito