testing: address G115: integer overflow conversion int issues and re-enable linter (gosec)

• related / same issue in moby: https://github.com/moby/moby/issues/48358

Description

Updating golangci-lint to the current version also includes some new linting rules around integer overflows. Most, if not all, of these are likely harmless, but we should evaluate each of them, and where possible either //nolint ignore them, or update the code.

opts/port.go:166:26: G115: integer overflow conversion int -> uint32 (gosec)
                          TargetPort:    uint32(port.Int()),
				                     ^
opts/port.go:167:26: G115: integer overflow conversion uint64 -> uint32 (gosec)
				PublishedPort: uint32(i),
				                     ^
cli/command/service/logs.go:115:32: G115: integer overflow conversion uint64 -> int (gosec)
			maxLength = getMaxLength(int(replicas))
			                            ^
cli/compose/convert/service.go:464:16: G115: integer overflow conversion uint64 -> int (gosec)
		retries = int(*healthcheck.Retries)
		             ^
cli/compose/convert/service.go:491:22: G115: integer overflow conversion int -> uint64 (gosec)
			attempts := uint64(policy.MaximumRetryCount)
			                  ^
cli/command/container/cp.go:112:36: G115: integer overflow conversion int -> uint (gosec)
				fmt.Fprint(buf, aec.Column(uint(len(header)+1)))
				                               ^
cli/command/container/opts.go:623:31: G115: integer overflow conversion int64 -> uint64 (gosec)
		IOMaximumBandwidth:   uint64(copts.ioMaxBandwidth),
		                            ^
cli/command/container/stats_helpers.go:187:25: G115: integer overflow conversion int64 -> uint64 (gosec)
	possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
	                       ^
cli/command/image/tree.go:195:18: G115: integer overflow conversion uint -> int (gosec)
	nameWidth := int(width)
	                ^
cli/command/service/progress/progress.go:344:42: G115: integer overflow conversion uint64 -> int (gosec)
		writeOverallProgress(u.progressOut, int(running), int(replicas), rollback)
		                                       ^
cli/command/service/progress/progress.go:305:45: G115: integer overflow conversion uint64 -> int (gosec)
		writeOverallProgress(u.progressOut, 0, int(replicas), rollback)
		                                          ^
cli/command/service/progress/progress.go:387:51: G115: integer overflow conversion int -> uint64 (gosec)
	if u.done || replicas > maxProgressBars || uint64(mappedSlot) > replicas {
	                                                 ^
cli/command/service/progress/progress.go:578:20: G115: integer overflow conversion uint64 -> int (gosec)
		concurrent:   int(*service.Spec.Mode.ReplicatedJob.MaxConcurrent),
		                 ^
cli/command/service/progress/progress.go:579:20: G115: integer overflow conversion uint64 -> int (gosec)
		total:        int(*service.Spec.Mode.ReplicatedJob.TotalCompletions),
		                 ^

Start with the G115 findings listed in opts/port.go, cli/command/service/logs.go, cli/compose/convert/service.go, cli/command/container/cp.go, cli/command/container/opts.go, cli/command/container/stats_helpers.go, cli/command/image/tree.go, and cli/command/service/progress/progress.go. Review each conversion and either update the code or mark harmless cases as ignored, then rerun the updated golangci-lint checks; done means the listed findings are addressed and the linter is re-enabled.