[TASK] Activate all packages in unit tests

Introduce a new package manager class for unit tests
that scans and activates all packages found in
package base paths.

Resolves: #57487
Releases: 6.2
Change-Id: Id0cd50db68fd94a31a996496fd5c54049ca94e78
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Change-Id: I54ba3a2c01701d6d9245ee3d269d5b09c2ded9f6