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Always merge dev ui launcher manifest for standalone and trichrome
webview into the final manifest unconditionally similar to monochrome
launcher manifest.

Use jinja_template to:
- Generate the manifests for all variants from one Manifest file.
- Pass a variable to determine the default enabled state for the
  launcher activity-alias.

Standalone, Trichrome and Monochrome WebView, all use one activity-alias
to show the launcher icon.

Change the name and the behaviour of the GN flag to always show the
launcher icon. If the flag is set to true then Monochrome will always
show the icon unconditionally.

Fixed: 1047824
Test: Enable/Disable the flag for stable/prestable WebView variants
Test: check no changes permissions in standalone and trichrome manifest
Change-Id: Ida10e39e294715e69ad19f1253cf302113322cc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098804Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Auto-Submit: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751735}