fix(reusePaths): pass test-regression task

[SethFalco]

Locally, I set reusePaths as a default plugin, then resolved any issues with existing tests so that it'll pass in those scenarios.

The issues I encountered:

• We removed IDs that were being used in ID selectors in the global stylesheet.
• If inlineStyles was run before reusePaths, this would break as it would copy the styles over as well, which got precedence over its own styles.
• If convertShapeToPath ran before reusePaths, it would break because rects would become paths, and if that rect had *-opacity attributes, they would get copied over and take precedence for all paths.

This resolves them by:

• Check if an ID is referenced in a selector in the document styles first, and if so, creates a new ID.
• More accurately perform as the description describes. Only copy over fill, stroke, and d, and the id if appropriate.

With this, we have all tests passing and 0 mismatches in yarn run test-regression.
The only difference is that if reusing the original ID, it's moved to the end of the path def. This PR also results in making SVGs smaller, as we were duplicating attributes before.

Metrics

Executed with preset-default and reusePaths enabled:

SVG	Time	% reduced	final size
Original	N/A	N/A	109.435 KiB
v3.0.2	118 ms	8.1%	100.567 KiB
this branch	118 ms	8.5%	100.16 KiB

SVG	Time	% reduced	final size
Original	N/A	N/A	15060.532 KiB
v3.0.2	15625 ms	35.8%	9663.785 KiB
main (bd750ce)	15085 ms	36.1%	9628.565 KiB
this branch	14820 ms	36.8%	9515.798 KiB

Note

• The reusePaths plugin is not enabled by default, this was just to minimize breaking SVGs.