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/normalizeUrlOrigin.ts

@@ -0,0 +1,15 @@
+import { getURLSafely } from '@/utils/getURLSafely';
+import { isDefined } from '@/utils/validation';
+
+// Lowercases the URL origin (scheme + host) and removes a trailing slash.
+// URL() already lowercases the origin and preserves percent-encoded sequences
+// in the path, query, and hash (e.g. %2F stays %2F, %2520 stays %2520).
+export const normalizeUrlOrigin = (rawUrl: string) => {
+  const url = getURLSafely(rawUrl);
+
+  if (!isDefined(url)) {
+    return rawUrl;
+  }
+
+  return (url.origin + url.pathname + url.search + url.hash).replace(/\/$/, '');
+};