feat: backport allowing noModule attribute on script tags to React 15

[snyamathi]

Summary

This PR backports this PR which added support for the nomodule attribute to React 15 as well. I'm not sure how likely this is to get into a release, but we're still stuck on React 15 for a variety of reasons. It would be great if we could add support for this attribute to React 15.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#attr-nomodule

nomodule
This Boolean attribute is set to indicate that the script should not be executed in browsers that support ES2015 modules — in effect, this can be used to serve fallback scripts to older browsers that do not support modular JavaScript code.

Test Plan

The tests pass locally, though I didn't add a new test since it seems like we haven't added one for each attribute (example for the PR which added nonce here) though I could look into that if need be.

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[gaearon]

What's stopping you from upgrading?

[snyamathi]

Outside of the usual tech debt, the largest limitation is #11189 - we do a lot of SSR and there's legacy code that relies on the checksum

[stale]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[snyamathi]

I would still like to see this go in if possible

[stale]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[snyamathi]

I'd still like to get this in, if possible.