[tests] remove border router MATN tests

[jwhui]

Remove MATN border router certification tests as they have been replaced by equivalent tests in the ot-br-posix repository under: https://github.com/openthread/ot-br-posix/tree/main/tests/scripts/expect

The new tests run using the docker-in-docker framework.

Deleted tests:

• MATN_02_MLRFirstUse.py
• MATN_03_InvalidCommissionerDeregistration.py
• MATN_04_MulticastListenerTimeout.py
• MATN_05_ReregistrationToSameMulticastGroup.py
• MATN_09_DefaultBRMulticastForwarding.py
• MATN_12_HopLimitProcessing.py
• MATN_15_ChangeOfPrimaryBBRTriggersRegistration.py
• MATN_16_LargeNumberOfMulticastGroupSubscriptionsToBBR.py

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request removes several legacy MATN border router certification tests. These tests have been replaced by updated, equivalent implementations in the ot-br-posix repository that utilize the docker-in-docker testing framework, streamlining the testing process and ensuring better maintenance.

Highlights

• Cleanup of obsolete tests: Removed eight MATN border router certification tests that have been superseded by equivalent tests in the ot-br-posix repository.

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[gemini-code-assist]

Code Review

This pull request removes several multicast-related integration test files (MATN_02, MATN_03, MATN_04, MATN_05, MATN_09, MATN_12, MATN_15, and MATN_16) from the test suite. As there are no review comments provided, I have no additional feedback to offer.

[github-actions]

Merging #13306 into main

name	branch	text	data	bss	total
ot-cli-ftd	815264e	480920	860	66508	548288
	55778d1	480920	860	66508	548288
	+/-	+0	+0	+0	+0
ot-ncp-ftd	815264e	446300	764	61744	508808
	55778d1	446300	764	61744	508808
	+/-	+0	+0	+0	+0
ot-cli-mtd	815264e	373624	764	50908	425296
	55778d1	373624	764	50908	425296
	+/-	+0	+0	+0	+0
ot-ncp-mtd	815264e	354956	764	46176	401896
	55778d1	354956	764	46176	401896
	+/-	+0	+0	+0	+0
ot-cli-ftd-br	815264e	592312	864	130660	723836
	55778d1	592312	864	130660	723836
	+/-	+0	+0	+0	+0
ot-rcp	815264e	63936	568	20812	85316
	55778d1	63936	568	20812	85316
	+/-	+0	+0	+0	+0

Library files

name	branch	text	data	bss	total
libopenthread-ftd.a	815264e	250140	95	40287	290522
	55778d1	250140	95	40287	290522
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd.a	815264e	61777	0	8091	69868
	55778d1	61777	0	8091	69868
	+/-	+0	+0	+0	+0
libopenthread-ncp-ftd.a	815264e	33359	0	5948	39307
	55778d1	33359	0	5948	39307
	+/-	+0	+0	+0	+0
libopenthread-mtd.a	815264e	170146	0	24719	194865
	55778d1	170146	0	24719	194865
	+/-	+0	+0	+0	+0
libopenthread-cli-mtd.a	815264e	41482	0	8059	49541
	55778d1	41482	0	8059	49541
	+/-	+0	+0	+0	+0
libopenthread-ncp-mtd.a	815264e	25783	0	5948	31731
	55778d1	25783	0	5948	31731
	+/-	+0	+0	+0	+0
libopenthread-ftd-br.a	815264e	362242	99	104399	466740
	55778d1	362242	99	104399	466740
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd-br.a	815264e	80892	0	8131	89023
	55778d1	80892	0	8131	89023
	+/-	+0	+0	+0	+0
libopenthread-rcp.a	815264e	9946	0	5060	15006
	55778d1	9946	0	5060	15006
	+/-	+0	+0	+0	+0
libopenthread-radio.a	815264e	20637	0	246	20883
	55778d1	20637	0	246	20883
	+/-	+0	+0	+0	+0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.59%. Comparing base (815264e) to head (4a6b4b7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13306      +/-   ##
==========================================
+ Coverage   70.34%   72.59%   +2.25%     
==========================================
  Files         703      704       +1     
  Lines       96719    94405    -2314     
==========================================
+ Hits        68034    68538     +504     
+ Misses      28685    25867    -2818     

see 154 files with indirect coverage changes

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