Revert "[cros-elements] Integrate cros-button with Chromium's TS pipeline."

This reverts commit 9412a67825a039e2ed2e5cb1fefea0b21fe8eab0.

Reason for revert:
Breaks chrome uprev:
https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3614498

Probably could repro via "emerge-<board> chromeos-chrome".

Original change's description:
> [cros-elements] Integrate cros-button with Chromium's TS pipeline.
>
> This CL weaves the Chromium TypeScript pipeline into the cros-elements
> build process.
>
> In order to successfully resolve TS imports at
> compile time, path_mappings are added to resolve libraries to their
> paths on disk.
>
> In order to successfully resolve imports at runtime, particularly
> "tslib", which is added by the compiler, an extra import-rewriting step
> has been added which rewrites the import to point to chrome://resources.
>
> TEST=Check that buttons render on chrome://crostini-installer or run CrostiniInstaller browser_tests.
>
> Bug: b/229812484, 1320176
> Change-Id: I88195b66b4d321f279dfe17bde1eab2622611fed
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3594156
> Commit-Queue: Christopher Lam <calamity@chromium.org>
> Reviewed-by: Giovanni Ortuno Urquidi <ortuno@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#997045}

Bug: b/229812484, 1320176
Bug: 1320856
Change-Id: I48c19c615ca70595d434fe185db273090d33f192
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3614655
Auto-Submit: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#997370}