Uncapitalize error messages; enable revive.error-strings

[alexandear]

The PR fixes error messages according to the https://go.dev/wiki/CodeReviewComments#error-strings

Error strings should not be capitalized (unless beginning with proper nouns or acronyms) or end with punctuation, since they are usually printed following other context.

Also, enables revive.error-strings to automatically detect this with golangci-lint.

Details

❯ golangci-lint run
pkg/qemu/qemu.go:1001:24: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
        return "", errors.New("Failed to locate virtiofsd")
                              ^
pkg/qemu/qemu_driver.go:291:35: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
                        errs = append(errs, fmt.Errorf("Failed to kill virtiofsd instance #%d: %w", i, err))
                                                       ^
pkg/qemu/entitlementutil/entitlementutil.go:54:21: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
                return fmt.Errorf("Failed to write to a temporary file %q for signing QEMU binary: %w", entName, err)
                                  ^
pkg/vz/vz_driver_darwin.go:185:20: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
        return fmt.Errorf("RunGUI is not supported for the given driver '%s' and display '%s'", "vz", *l.Yaml.Video.Display)
                          ^
pkg/vz/errors_darwin.go:7:40: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
var errRosettaUnsupported = errors.New("Rosetta is unsupported on non-ARM64 hosts")
                                       ^
cmd/limactl/copy.go:101:21: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
                return fmt.Errorf("More than one (instance) host is involved in this command, this is only supported for openSSH v8.0 or higher")
                                  ^
cmd/limactl/disk.go:109:21: error-strings: error strings should not be capitalized or end with punctuation or a newline (revive)
                return fmt.Errorf("Failed to create %s disk in %q: %w", format, diskDir, err)
                                  ^

[jandubois]

Thanks, LGTM