Show error notification if extension settings fail to sync with the sidecar preferences API

[sentry-io]

Sentry Issue: VSCODE-EXTENSION-K9

ResponseError: Response returned an error code
  File "..\src\clients\sidecar\runtime.ts", line 147, in {_BaseAPI#2}.request
    throw new ResponseError(response, "Response returned an error code");
  File "..\src\clients\sidecar\apis\PreferencesResourceApi.ts", line 75, in PreferencesResourceApi.gatewayV1PreferencesPutRaw
    const response = await this.request(
  File "..\src\clients\sidecar\apis\PreferencesResourceApi.ts", line 95, in PreferencesResourceApi.gatewayV1PreferencesPut
    const response = await this.gatewayV1PreferencesPutRaw(requestParameters, initOverrides);
  File "..\src\preferences\updates.ts", line 40, in updatePreferences
    const resp = await client.gatewayV1PreferencesPut({
  File "..\src\preferences\listener.ts", line 25, in <anonymous>
    await updatePreferences({
...
(1 additional frame(s) were not displayed)

Example:

{
  "status":"400",
  "code":"invalid_preferences",
  "title":"Provided preferences are not valid",
  "id":"fa75285e-419d-4525-8596-b927fcb0563e",
  "errors":[
    {
      "code":"cert_not_found",
      "title":"Cert file cannot be found",
      "detail":"The cert file <path> cannot be found.",
      "source":"/spec/tls_pem_paths"
    }
  ]
}