Add PrereleaseError for handling failed pre-release version installs

```
~>  packer init mondoo_req.pkr.hcl
Failed getting the "github.com/mondoohq/cnspec" plugin:
error:
Remote installation of the plugin version 10.8.1-dev is unsupported.
This is likely an upstream issue with the 10.8.1 release, which should be reported.
If you require this specific version of the plugin, download the binary and install it manually.

packer plugins install --path '<plugin_binary>' github.com/mondoohq/cnspec

```

packer/plugin-getter/plugins.go

@@ -93,6 +93,25 @@ func (rlerr *RateLimitError) Error() string {
 	return s
 }
 
+// PrereleaseInstallError is returned when a getter encounters the install of a pre-release version.
+type PrereleaseInstallError struct {
+	RequestedVersion, ReportedVersion string
+	Source                            string
+}
+
+func (pe *PrereleaseInstallError) Error() string {
+	s := strings.Builder{}
+	s.WriteString("error:\n")
+	fmt.Fprintf(&s, "Remote installation of the plugin version %s is unsupported.\n", pe.ReportedVersion)
+
+	if pe.RequestedVersion != pe.ReportedVersion {
+		fmt.Fprintf(&s, "This is likely an upstream issue with the %s release, which should be reported.\n", pe.RequestedVersion)
+	}
+	s.WriteString("If you require this specific version of the plugin, download the binary and install it manually.\n")
+	fmt.Fprintf(&s, "\npacker plugins install --path '<plugin_binary>' %s\n", pe.Source)
+	return s.String()
+}
+
 func (pr Requirement) FilenamePrefix() string {
 	if pr.Identifier == nil {
 		return "packer-plugin-"
@@ -869,7 +888,6 @@ func (pr *Requirement) InstallLatest(opts InstallOptions) (*Installation, error)
 							errs = multierror.Append(errs, err)
 							log.Printf("[WARNING] %v, ignoring", err)
 						}
-
 						outputFileCS, err := checksum.Checksummer.Sum(tmpOutputFile)
 						if err != nil {
 							err := fmt.Errorf("failed to checksum binary file: %s", err)
@@ -896,25 +914,19 @@ func (pr *Requirement) InstallLatest(opts InstallOptions) (*Installation, error)
 							continue
 						}
 
-						// Since releases only can be installed remotely, a non-empty prerelease version
-						// means something's not right on the release, as it should report a final version instead.
+						// Since only final releases can be installed remotely, a non-empty prerelease version
+						// means something's not right on the release, as it should report a final version.
 						//
 						// Therefore to avoid surprises (and avoid being able to install a version that
 						// cannot be loaded), we error here, and advise users to manually install the plugin if they
 						// need it.
 						if descVersion.Prerelease() != "" {
-							err := fmt.Errorf(`binary for %[1]q release v%[2]s reported version %[3]q.
-
-Remote installation of pre-release binaries is unsupported an likely an upstream plugin issue.
-We encourage you to open an issue on the plugin repository asking to update the version information.
-If you require this specific version of the plugin, you can manually download the binary from the source and install
-the versioned binary as %[3]q using the following command:
-
-packer plugins install --path '<plugin_binary>' %[1]q`,
-								pr.Identifier.String(), version, desc.Version)
-
-							errs = multierror.Append(errs, err)
-							return nil, errs
+							err := PrereleaseInstallError{
+								Source:           pr.Identifier.String(),
+								RequestedVersion: version.String(),
+								ReportedVersion:  desc.Version,
+							}
+							return nil, &err
 						}
 
 						if err := os.Rename(tmpBinFileName, outputFileName); err != nil {
@@ -926,6 +938,8 @@ packer plugins install --path '<plugin_binary>' %[1]q`,
 							err := fmt.Errorf("failed to write local binary checksum file: %s", err)
 							errs = multierror.Append(errs, err)
 							log.Printf("[WARNING] %v, ignoring", err)
+							os.Remove(outputFileName)
+							continue
 						}
 
 						// Success !!
@@ -934,10 +948,8 @@ packer plugins install --path '<plugin_binary>' %[1]q`,
 							Version:    "v" + version.String(),
 						}, nil
 					}
-
 				}
 			}
-
 		}
 	}