Merges the BundledUpdateManager into the BundledUpdateService.
Also fixes up the bazel build files.
No-Docs-Update-Reason: Module still in early development
Requires: pigweed-internal:15640
Change-Id: I7061ed9ad02009a1ece92599b4900038eaefc3e7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/62420
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>