fix(links): preserve percent-encoded URLs during normalization (#18792)

## Summary

This preserves percent-encoded payloads when normalizing links fields.

`lowercaseUrlOriginAndRemoveTrailingSlash` was decoding the path and
query string while lowercasing the URL origin. That changes URLs where
encoded payloads are semantically significant, such as Google Maps links
containing `%2F` segments.

Closes #18698.

## Changes

- stop decoding the path/query payload in
`lowercaseUrlOriginAndRemoveTrailingSlash`
- preserve the raw path, query, and hash while still lowercasing the
origin and trimming a trailing slash
- update shared URL normalization tests to assert encoded payloads stay
encoded
- add a server-side regression test covering imported links field
normalization

## Validation

- `corepack yarn jest --config packages/twenty-shared/jest.config.mjs
packages/twenty-shared/src/utils/url/__tests__/lowercaseUrlOriginAndRemoveTrailingSlash.test.ts
--runInBand`
- `corepack yarn jest --config packages/twenty-server/jest.config.mjs
packages/twenty-server/src/engine/core-modules/record-transformer/utils/__tests__/transform-links-value.util.spec.ts
--runInBand`
- `corepack yarn nx test twenty-server --runInBand
--testFile=src/engine/core-modules/record-transformer/utils/__tests__/transform-links-value.util.spec.ts`

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-shared/src/utils/url/normalizeUrl.ts

@@ -0,0 +1,13 @@
+import { ensureAbsoluteUrl } from '@/utils/url/ensureAbsoluteUrl';
+import { normalizeUrlOrigin } from '@/utils/url/normalizeUrlOrigin';
+
+// Ensures the URL has a protocol, lowercases the origin, and removes a trailing slash.
+export const normalizeUrl = (url: string): string => {
+  const trimmed = url.trim();
+
+  if (trimmed === '') {
+    return trimmed;
+  }
+
+  return normalizeUrlOrigin(ensureAbsoluteUrl(trimmed));
+};