feat(build): consolidate repo flags in build and release subcommand

Previously the behavior was inconsistent and not fully fulfilling its
purpose of only using --repo once when initially pushing a new and
unknown package to the official repositories.

Consolidate the behavior by only allowing to use --repo during the
initial packaging and disallow any subsequent usage. The expected user
experience is to subsequently use --testing or --staging to influence
the auto-detection of the build target. This avoids any kind of human
error which leads to releasing core packages to extra-testing by
accident.

Furthermore, allow the build subcommand to automatically fallback to
extra as the default stable repository target which greatly improves the
usability for AUR or local override builds.

Fixes #193
Fixes #191

Component: pkgctl build
Component: pkgctl release
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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