fix: issue with keys under ssr no-update root

[DylanPiercey]

Description

This PR fixes two issues.

1. fix: don't serialize component boundary keys if the owner isn't hydrated #1525 caused a regression which prevented adding keys for boundary components with no-update content.
2. Fixes an issue where keyed items under for a stateful component under a no-update section were not being registered.

Checklist:

• I have read the CONTRIBUTING document and have signed (or will sign) the CLA.
• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #1527 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1527      +/-   ##
=========================================
+ Coverage   90.49%   90.5%   +<.01%     
=========================================
  Files         353     353              
  Lines       12690   12695       +5     
=========================================
+ Hits        11484   11489       +5     
  Misses       1206    1206

Impacted Files	Coverage Δ
packages/marko/src/runtime/components/dom-data.js	50% <ø> (ø)	⬆️
...ges/marko/src/runtime/components/beginComponent.js	100% <100%> (ø)	⬆️
.../src/runtime/components/init-components-browser.js	83.04% <100%> (-0.2%)	⬇️
packages/marko/src/runtime/components/Component.js	95.87% <100%> (+0.07%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7a43266...4092ea4. Read the comment docs.