feat(runtime): enhance renderToString to support serializeShadowRootAsDeclarativeShadowRoot flag

make esm hydrate script

make test work

add unit test

fix prettier

wip

minor tweaks

apply more changes from #5787

get unit tests working

prettier

remove import

fix test

eslint fix

use dynamic import

minor e2e fixes

prettier

fix cspell

adjust tests

prettier

allow to run headless

make streaming work

fix tests

prettier

remove obsolete file

this should fix pre-render test

prettier

finally get it right

prettier

Co-authored-by: Tanner Reits <[email protected]>