Pass through uninstall error messages from backend (#22208)

# Checklist for submitter

- [x] Manual QA for all new/changed functionality

[See
Slack](https://fleetdm.slack.com/archives/C01EZVBHFHU/p1726605318985819?thread_ts=1726588126.583269&cid=C01EZVBHFHU)
from @noahtalerman for context

frontend/pages/hosts/details/cards/Software/HostSoftware.tsx

@@ -24,7 +24,7 @@ import Spinner from "components/Spinner";
 import { generateSoftwareTableHeaders as generateHostSoftwareTableConfig } from "./HostSoftwareTableConfig";
 import { generateSoftwareTableHeaders as generateDeviceSoftwareTableConfig } from "./DeviceSoftwareTableConfig";
 import HostSoftwareTable from "./HostSoftwareTable";
-import { getErrorMessage } from "./helpers";
+import { getInstallErrorMessage, getUninstallErrorMessage } from "./helpers";
 
 const baseClass = "software-card";
 
@@ -190,7 +190,7 @@ const HostSoftware = ({
           "Software is installing or will install when the host comes online."
         );
       } catch (e) {
-        renderFlash("error", getErrorMessage(e));
+        renderFlash("error", getInstallErrorMessage(e));
       }
       setSoftwareIdActionPending(null);
       refetchSoftware();
@@ -211,7 +211,7 @@ const HostSoftware = ({
           </>
         );
       } catch (e) {
-        renderFlash("error", "Couldn't uninstall. Please try again.");
+        renderFlash("error", getUninstallErrorMessage(e));
       }
       setSoftwareIdActionPending(null);
       refetchSoftware();

frontend/pages/hosts/details/cards/Software/helpers.tsx

@@ -3,7 +3,10 @@ import { getErrorReason } from "interfaces/errors";
 import { trimEnd, upperFirst } from "lodash";
 
 const INSTALL_SOFTWARE_ERROR_PREFIX = "Couldn't install.";
-const DEFAULT_ERROR_MESSAGE = `${INSTALL_SOFTWARE_ERROR_PREFIX} Please try again.`;
+const DEFAULT_INSTALL_ERROR_MESSAGE = `${INSTALL_SOFTWARE_ERROR_PREFIX} Please try again.`;
+
+const UNINSTALL_SOFTWARE_ERROR_PREFIX = "Couldn't uninstall.";
+const DEFAULT_UNINSTALL_ERROR_MESSAGE = `${UNINSTALL_SOFTWARE_ERROR_PREFIX} Please try again.`;
 
 const createOnlyInstallableOnMacOSMessage = (reason: string) =>
   `Couldn't install. ${reason.replace("darwin", "macOS")}.`;
@@ -28,7 +31,7 @@ const showAPIMessage = (message: string) => {
 };
 
 // eslint-disable-next-line import/prefer-default-export
-export const getErrorMessage = (e: unknown) => {
+export const getInstallErrorMessage = (e: unknown) => {
   const reason = upperFirst(trimEnd(getErrorReason(e), "."));
 
   if (reason.includes("fleetd installed")) {
@@ -41,5 +44,28 @@ export const getErrorMessage = (e: unknown) => {
     return reason;
   }
 
-  return DEFAULT_ERROR_MESSAGE;
+  return DEFAULT_INSTALL_ERROR_MESSAGE;
+};
+
+// eslint-disable-next-line import/prefer-default-export
+export const getUninstallErrorMessage = (e: unknown) => {
+  const reason = upperFirst(trimEnd(getErrorReason(e), "."));
+
+  if (
+    reason.includes("run script") ||
+    reason.includes("running script") ||
+    reason.includes("have fleetd") ||
+    reason.includes("only on")
+  ) {
+    return `${UNINSTALL_SOFTWARE_ERROR_PREFIX} ${reason}.`;
+  } else if (reason.startsWith("Couldn't uninstall software.")) {
+    return reason.replace(
+      "Couldn't uninstall software.",
+      "Couldn't uninstall."
+    );
+  } else if (reason.startsWith("No uninstall script exists")) {
+    return `${UNINSTALL_SOFTWARE_ERROR_PREFIX}. An uninstall script does not exist for this package.`;
+  }
+
+  return DEFAULT_UNINSTALL_ERROR_MESSAGE;
 };