🏗♻️🚮🐛 Refactor compile() in build-system/tasks/helpers.js

[rsimha]

Today, there is one giant function called compile() in build-system/tasks/helpers.js that compiles the various AMP build targets in minified and unminified modes.

This PR does the following:

• Removes the obsolete checkTypes option (added in Fix many, many type warnings. #3539, made obsolete by Type check first extension (amp-youtube) #4931)
• Removes the obsolete preventRemoveAndMakeDir option (added in fix race deletions of polyfill folders to accomodate includePolyfill on more than just the main binary #2880, but never used as false)
• Reorganizes compile() into compileAllMinifiedTargets() and compileAllUnminifiedTargets()
• Applies a strict order to the compilation of v0.js and v0-esm.js, thereby fixing the race in race between v0.js and v0-esm.js generation for closure #18934

Follow up to #3539 and #4931
Follow up to #2880
Fixes #18934

[rsimha]

/to @erwinmombay @jridgewell

[rsimha]

Tested gulp build --fortesting and gulp dist --fortesting, and made sure source maps are good when used with --full_sourcemaps.