[build] Specify dependencies on plugins via plugin IDs

https://github.com/flutter/flutter-intellij/blob/master/flutter-idea/build.gradle.kts#L58

Replace plugin directory names with the Plugin ID given in `plugin.xml`, see https://plugins.jetbrains.com/docs/intellij/plugin-dependencies.html#bundled-and-other-plugins

Open flutter-idea/build.gradle.kts at line 58 and compare the listed plugin dependencies with the Plugin IDs in their plugin.xml files, using the linked IntelliJ plugin-dependencies documentation as guidance. Replace directory-name references with those IDs, then verify the dependency declarations consistently use plugin IDs.

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