Current implementation parses the provider info from all manifests in
every app the first time getInstalledProvidersForProfile is called,
which causes unnecessary delay on the call-site if only a single package
was requested.
This CL ensures widgets loading are deferred further down the line,
until it is absolutely needed to be parsed.
Bug: 202356231
Test: manual
Change-Id: I793bd818781ae956cd5bc590a315c669d01e7ca6
9c2cb7e257