chore(web): web build streamlining

[jahorton]

Fixes #9670. Addresses #9670. While it does fix It fixes the biggest concern from the issue, though there are a few other nits that this doesn't outright address.

(As per comments received on this PR, I've updated this to "fix" the issue.)

1. The android-harness build.sh is still called directly; it's not on a child-project path related to the build product that triggers it. That said... it's only called one time.

2. The build scripts for the tools do still get called twice, although they at least don't "lose the environment" now.

[web/src/tools] child build, parameters: <build --builder-child --deps>
[web/src/tools/testing/bulk_rendering] child build, parameters: <build --builder-child --deps>
[web/src/tools/testing/bulk_rendering] ## build starting...
[web/src/tools/testing/bulk_rendering] ## build completed successfully
[web/src/tools/testing/recorder] child build, parameters: <build --builder-child --deps>
[web/src/tools/testing/recorder] ## build starting...
[common/web/recorder] dependency build, started by web/src/tools/testing/recorder
[common/web/recorder] build.sh parameters: <configure build --deps --builder-dep-parent web/src/tools/testing/recorder>
[common/web/recorder] skipping configure, up-to-date
[common/web/recorder] skipping build, up-to-date
[web/src/tools/testing/recorder] ## build completed successfully
[web/src/tools/building/sourcemap-root] child build, parameters: <build --builder-child --deps>
[web/src/tools/building/sourcemap-root] ## build starting...
[common/tools/sourcemap-path-remapper] dependency build, started by web/src/tools/building/sourcemap-root
[common/tools/sourcemap-path-remapper] build.sh parameters: <configure build --deps --builder-dep-parent web/src/tools/building/sourcemap-root>
[common/tools/sourcemap-path-remapper] skipping configure, up-to-date
[common/tools/sourcemap-path-remapper] skipping build, up-to-date
[web/src/tools/building/sourcemap-root] ## build completed successfully

Followed immediately by:

[web/src/test/manual] child build, parameters: <build --builder-child --deps>
[web/src/test/manual] ## build starting...
[common/web/sentry-manager] dependency build, started by web/src/test/manual
[common/web/sentry-manager] build.sh parameters: <configure build --deps --builder-dep-parent web/src/test/manual>
[common/web/sentry-manager] skipping configure, up-to-date
[common/web/sentry-manager] skipping build, up-to-date
[web/src/tools] dependency build, started by web/src/test/manual
[web/src/tools] build.sh parameters: <configure build --deps --builder-dep-parent web/src/test/manual>
[web/src/tools/testing/bulk_rendering] child build, parameters: <build --builder-child --deps>
[web/src/tools/testing/bulk_rendering] ## build starting...
[web/src/tools/testing/bulk_rendering] ## build completed successfully
[web/src/tools/testing/recorder] child build, parameters: <build --builder-child --deps>
[web/src/tools/testing/recorder] ## build starting...
[web/src/tools/testing/recorder] ## build completed successfully
[web/src/tools/building/sourcemap-root] child build, parameters: <build --builder-child --deps>
[web/src/tools/building/sourcemap-root] ## build starting...
[web/src/tools/building/sourcemap-root] ## build completed successfully
[web/src/test/manual] ## build completed successfully

Compare the later entries in both sections; they're nigh-identical.

First set of calls: as a child script, from the top-level build.sh.

Second set: as a dependency, from web/src/test/manual, which does not include web/src/tools as a viable child-project folder.

@keymanapp-test-bot skip

[keymanapp-test-bot]

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[mcdurdin]

Compare the later entries in both sections; they're nigh-identical.

First set of calls: as a child script, from the top-level build.sh.

Second set: as a dependency, from web/src/test/manual, which does not include web/src/tools as a viable child-project folder.

I reckon we should consider tweaking builder.inc.sh to handle the scenario of child vs dependency calls resulting in multiple calls.

[mcdurdin]

These changes look good and go a long way in the right direction, enough to go ahead and mark it as closing the issue I think. And we might open a separate issue to mitigate the double-build scenario from dep vs child calls?

[keyman-server]

Changes in this pull request will be available for download in Keyman version 17.0.190-alpha