[24549] Remove stale tcp channels

[cferreiragonz]

Description

This PR introduces logic to remove stale TCP ACCEPT type channels when the listening operation ends (Asio detects and closes the socket). We can only perform this action on ACCEPT type channels because the re-connection mechanism of the CONNECT type channels rely on detecting stale channels and try to re-establish the connection when data needs to be sent.

@Mergifyio backport 3.2.x 2.14.x

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A: Any new/modified methods have been properly documented using Doxygen.
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• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• Changes are API compatible.
• N/A: New feature has been added to the versions.md file (if applicable).
• N/A: New feature has been documented/Current behavior is correctly described in the documentation.
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
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• Check contributor checklist is correct.
• If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[Danipiza]

Possible data race. We can use in MockTCPv4Transport.h

size_t get_channel_resources_size() const
{
    std::lock_guard<std::mutex> lock(unbound_map_mutex_);
    return unbound_channel_resources_.size();
}

[Danipiza]

Same here

size_t get_unbound_channel_resources_size() const
{
    std::lock_guard<std::mutex> lock(unbound_map_mutex_);
    return unbound_channel_resources_.size();
}