Enable Channel Check Linter

[mdulin2]

This is part two of integrating the channel linter into the repository. Part one added the custom linter flow, and the channel linter; this enables the channel linter.

In general, three types of changes were made:

• Made the channel non-blocking by using the WriteToChannelWithoutBlocking helper. Done on errC and metric channel writes mostly.
• Added ctx.Done() to the select for smoother shutdown.
• Add nolint:channelcheck with an explanation on why the current setup is correct.

It should be noted that msgC is made as an exception to the channelcheck linter because it should always be a blocking write. With the addition of the nolint linter, we can't add nolint:channelcheck with a comment there. So, I left the original Note on channel capacity comment as is.

[socket-security]

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