fix(web): adds null-guard for longpress-key validation

feat(web): es6 artifact for app/webview 📜 

feat(web): alternate artifact - es6-bundled Web 📜

change(web): KeymanWeb bundler-script centralization 📜

refactor(web): transformation of build-bundler into a common es-bundling command 📜

change(web): lm-worker bundling + wrapper script rework 📜

 chore(web): remove lm-worker `Array.from` polyfill and make `Symbol` polyfill conditional

Co-authored-by: Marc Durdin <marc@durdin.net>

Co-authored-by: Marc Durdin <marc@durdin.net>

fix(mac): write persisted options returned from Core

auto: increment master version to 17.0.239

feat(developer): escape bad markers 🙀 

chore(core): better reporting in ldml tests 🙀

feat(core): more regex testing 🙀 

fix(core): ldml fixes for normalization between transform groups 🙀

- move prepend_marker out of line
- replace bool for_regex with an enum
- cleanup another instance of \b -> \u0008

#9121

fix(developer): quell internal error when  a section fails 🙀

Merge branch 'chore/core/ldml-test-robust-epic-ldml' into feat/developer/9121-reject-bad-regex-epic-ldml

Co-authored-by: Marc Durdin <marc@durdin.net>

Co-authored-by: Marc Durdin <marc@durdin.net>

auto: increment master version to 17.0.238

chore(developer): honor prompt to upgrade in kmc

feat(developer): Consolidate public APIs for kmc modules

- needed to remove/re-add the “≈≈[\u0001-\uD7FE]” format  (aka LDML_MARKER_ANY_INDEX)

#9121

- escape markers to prevent the n'th marker from having some other meaning

- marker overrun! the 40th marker becomes a parenthesis, breaking regex

feat(core): ldml proper regex implementation 🙀🙀 #9121

- more easily handle test events

- match in a set
- quantifiers

For: #9121

- more err reporting out of inner functions such as key not found
- helper functions for setting FAIL and SKIP actions with messages
- colorization

For: #9121