Preserve custom registry value when selecting a different version

[momesgin]

Summary

Fixes #15890

Occurred changes and/or fixed issues

Technical notes summary

• Added a new method preserveCustomRegistryValue to preserve the user's values for the custom registry checkbox and its text input
• E2E test

Areas or cases that should be tested

First intall a chart, then go back to edit it. Play with different states for the custom registry checkbox and its text input while changing the version, and make sure the value of them persists.

Areas which could experience regressions

Make sure you can change the values of different inputs during the install specially in the step that has the version or project dropdown, and the installing process is successful.

Screenshot/Video

Checklist

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