Pass a language version to DartFormatter(). #1066

Job	Run time
analyze_and_format; Dart 3.5.0; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_...	3m 32s
mono_repo self validate	23s
analyze_and_format; Dart dev; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_ge...	4m 33s
unittest; Dart 3.5.0; PKG: _test_package; `dart test`	30s
unittest; Dart 3.5.0; PKG: generated/googleapis; `dart test`	6m 56s
unittest; Dart 3.5.0; PKG: discoveryapis_commons; `dart test`	33s
unittest; Dart 3.5.0; PKG: discoveryapis_generator; `dart test`	35s
unittest; Dart 3.5.0; PKG: generated/googleapis_beta; `dart test`	38s
unittest; Dart 3.5.0; PKG: googleapis_auth; `dart test -p chrome`	2m 26s
unittest; Dart 3.5.0; PKG: googleapis_auth; `dart test -p vm`	34s
unittest; Dart dev; PKG: _test_package; `dart test`	29s
unittest; Dart dev; PKG: discoveryapis_commons; `dart test`	30s
unittest; Dart dev; PKG: discoveryapis_generator; `dart test`	39s
unittest; Dart dev; PKG: generated/googleapis; `dart test`	6m 59s
unittest; Dart dev; PKG: generated/googleapis_beta; `dart test`	38s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p chrome`	1m 26s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p vm`	31s
	31m 52s

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