fix(style)(backgroundSize) - Passing unsupported backgroundSize on android causes crash

[intergalacticspacehighway]

Summary:

Below snippet would lead to divide by zero crash on android. Currently, "cover | contain" keywords are not supported for background size as these only work on actual images (url() syntax) and not on gradients. These keywords were supposed to be removed in this commit and added later in this PR

<View
  style={{
    experimental_backgroundImage: "radial-gradient(circle, #f093fb, #f5576c)",
    experimental_backgroundSize: "cover",
    width: 100,
    height: 100
  }}
/>;

Changelog:

[ANDROID] [FIXED] - Unsupported background size value leading to crash

Test Plan:

Tested the BackgroundImage example on RNTester.

[meta-codesync]

@NickGerleman has imported this pull request. If you are a Meta employee, you can view this in D95202400.

[intergalacticspacehighway]

Currently keeping these keywords in types as they have a lot of testcases in JS. These will behave no-op with gradient anyways. So i think it should be fine. Eventually we'll add them with #54994