Rename tunnelsByAgentId, tunnelsByAgentIdHashKey, findRequestsByAgentId, findRequestsForAgentId to ensure consistency for initialisms/acronyms
As it is suggested in #468 (closed) to handle the issue in multiple MRs, this MR does not include all of the needed renamings, but only the following:
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Rename findRequestsForAgentId to findRequestsForAgentID
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Rename findRequestsByAgentId to findRequestsByAgentID
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Rename tunnelsByAgentIdHashKey to tunnelsByAgentIDHashKey
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Rename tunnelsByAgentId to tunnelsByAgentID
See https://go.dev/wiki/CodeReviewComments#initialisms for more information.