feat: set admin_key during migration and unit tests

[iwsimon]

Description: Set admin_key during migration. Added more unit tests to make 100% classes and lines covered under hedera-addressbook-service-impl.

Related issue(s):

Fixes #14070

Notes for reviewer:

Checklist

• [ ] Documented (Code comments, README, etc.)
• [ ] Tested (unit, integration, etc.)

[github-actions[bot]]

Node: Unit Test Results

  1 540 files    1 540 suites   3h 28m 10s :stopwatch: 115 766 tests 115 707 :white_check_mark: 59 :zzz: 0 :x: 124 081 runs  124 022 :white_check_mark: 59 :zzz: 0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Restart) Results

3 tests   3 :white_check_mark:  6m 51s :stopwatch: 3 suites  0 :zzz: 3 files    0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Token) Results

 20 files   20 suites   6m 35s :stopwatch: 266 tests 266 :white_check_mark: 0 :zzz: 0 :x: 341 runs  341 :white_check_mark: 0 :zzz: 0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Node Death Reconnect) Results

3 tests   2 :white_check_mark:  7m 48s :stopwatch: 3 suites  0 :zzz: 3 files    1 :x:

For more details on these failures, see this check.

Results for commit fc502c49.

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Node: HAPI Test (Crypto) Results

 24 files   24 suites   12m 29s :stopwatch: 362 tests 362 :white_check_mark: 0 :zzz: 0 :x: 369 runs  369 :white_check_mark: 0 :zzz: 0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Time Consuming) Results

19 tests   19 :white_check_mark:  22m 42s :stopwatch:  4 suites   0 :zzz:  4 files     0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Misc) Results

 51 files   51 suites   20m 47s :stopwatch: 357 tests 357 :white_check_mark: 0 :zzz: 0 :x: 375 runs  375 :white_check_mark: 0 :zzz: 0 :x:

Results for commit fc502c49.

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Node: HAPI Test (Smart Contract) Results

 73 files   73 suites   23m 9s :stopwatch: 623 tests 623 :white_check_mark: 0 :zzz: 0 :x: 677 runs  677 :white_check_mark: 0 :zzz: 0 :x:

Results for commit fc502c49.

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