fix(tm2/pkg/bft,os,p2p): close leaking resources

[odeke-em]

This change closes some leaking resources that were identified in a preliminary code read.

Fixes #3029
Fixes #3030
Fixes #3031

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tm2/pkg/bft/privval/utils.go	40.00%	2 Missing and 1 partial ⚠️
tm2/pkg/p2p/transport.go	40.00%	2 Missing and 1 partial ⚠️

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