Add buildAll task and fix fragile builds

[CydeWeys]

This commit adds the buildAll task to restore the existence of a target that builds everything, which was unintentionally removed when the default build was stripped down in PR #3068. It also introduces necessary sequential constraints to the console-webapp build tasks to prevent parallel execution from corrupting the Angular CLI cache. Finally, it addresses paths for the newer Angular esbuild output and hardens the style injection in ConsoleScreenshotTest to prevent fragile test failures.

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This change is 

[gbrodman]

is there a corresponding change to run this in CI?

@gbrodman reviewed 4 files and all commit messages, and made 1 comment.
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[CydeWeys]

No, or at least not yet. Unclear if we actually need to run all this stuff for CI (it would just slow it down).

@CydeWeys made 1 comment.
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[CydeWeys]

(Of course we can always do so, or increase the scope of the targets run in Kokoro anyway, as necessary. Doesn't have to be the buildAll, could be build plus something else. We'll see.)

@CydeWeys made 1 comment.
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[gbrodman]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on CydeWeys).