Add some checks when trying to join the same pool already joined

[emlowe]

WIP...

Fixes #7292

[coveralls-official]

Pull Request Test Coverage Report for Build 11716290246

Details

• 64 of 69 (92.75%) changed or added relevant lines in 4 files are covered.
• 39 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.03%) to 90.962%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
chia/cmds/plotnft_funcs.py	7	12	58.33%

Files with Coverage Reduction	New Missed Lines	%
chia/full_node/pending_tx_cache.py	1	96.55%
chia/cmds/plotnft_funcs.py	1	17.52%
chia/wallet/util/wallet_sync_utils.py	1	86.07%
chia/wallet/wallet_node.py	4	88.18%
chia/full_node/weight_proof.py	4	90.48%
chia/server/ws_connection.py	4	88.1%
chia/server/address_manager.py	5	90.48%
chia/full_node/full_node.py	7	85.9%
chia/server/node_discovery.py	12	79.45%

Totals
Change from base Build 11710907999:	0.03%
Covered Lines:	102969
Relevant Lines:	112961

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💛 - Coveralls

[github-actions]

File	Coverage	Missing Lines
chia/cmds/plotnft_funcs.py	58.3%	lines 78, 223, 368, 379, 398

Total	Missing	Coverage
69 lines	5 lines	92%