feat: enable feedback button on nightly releases (#8220)

## Summary

Enables the feedback button on nightly releases to collect user feedback
and distinguish it from stable releases in Zendesk.

## Changes

- Add distribution tracking to feedback URL (cloud/nightly/stable)
- Export `getDistribution()` and `ZENDESK_FIELDS` from support config
for reuse
- Enable feedback button for both cloud and nightly builds
- Track distribution in Zendesk as: `ccloud`, `oss-nightly`, or `oss`
- Fix type signatures for `normalizeIndustry`/`normalizeUseCase` to
accept `unknown`

## Requirements

- [ ] Support team needs to add `oss-nightly` as a valid value for the
distribution field in Zendesk

## Test plan

- [ ] Build and run nightly version, verify feedback button appears
- [ ] Click feedback button, verify Zendesk form opens with correct
distribution parameter
- [ ] Verify cloud builds still show feedback button as before
- [ ] Verify stable OSS builds don't show feedback button

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8220-feat-enable-feedback-button-on-nightly-releases-2ef6d73d3650816db81ef970919770a4)
by [Unito](https://www.unito.io)

src/platform/telemetry/utils/surveyNormalization.ts

@@ -526,7 +526,7 @@ const useCaseFuse = new Fuse(USE_CASE_CATEGORIES, FUSE_OPTIONS)
 /**
  * Normalize industry responses using Fuse.js fuzzy search
  */
-export function normalizeIndustry(rawIndustry: string): string {
+export function normalizeIndustry(rawIndustry: unknown): string {
   if (!rawIndustry || typeof rawIndustry !== 'string') {
     return 'Other / Undefined'
   }
@@ -554,7 +554,7 @@ export function normalizeIndustry(rawIndustry: string): string {
 /**
  * Normalize use case responses using Fuse.js fuzzy search
  */
-export function normalizeUseCase(rawUseCase: string): string {
+export function normalizeUseCase(rawUseCase: unknown): string {
   if (!rawUseCase || typeof rawUseCase !== 'string') {
     return 'Other / Undefined'
   }