[8.18] [Fleet] fix prerelease:boolean in package_service (#212054) (#…

…212084)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[Fleet] fix `prerelease:boolean` in package_service
(#212054)](#212054)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Julia
Bardi","email":"90178898+juliaElastic@users.noreply.github.com"},"sourceCommit":{"committedDate":"2025-02-21T13:51:21Z","message":"[Fleet]
fix `prerelease:boolean` in package_service (#212054)\n\nUse `boolean`
instead of `false` in `getPackages` to support querying\nprerelease
packages.","sha":"dbfb433ec28a080879c26232c7a8ea516efd082f","branchLabelMapping":{"^v9.1.0$":"main","^v8.19.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","Team:Fleet","backport:prev-major","v9.1.0"],"title":"[Fleet]
fix `prerelease:boolean` in
package_service","number":212054,"url":"https://github.com/elastic/kibana/pull/212054","mergeCommit":{"message":"[Fleet]
fix `prerelease:boolean` in package_service (#212054)\n\nUse `boolean`
instead of `false` in `getPackages` to support querying\nprerelease
packages.","sha":"dbfb433ec28a080879c26232c7a8ea516efd082f"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/212054","number":212054,"mergeCommit":{"message":"[Fleet]
fix `prerelease:boolean` in package_service (#212054)\n\nUse `boolean`
instead of `false` in `getPackages` to support querying\nprerelease
packages.","sha":"dbfb433ec28a080879c26232c7a8ea516efd082f"}}]}]
BACKPORT-->

Co-authored-by: Julia Bardi <90178898+juliaElastic@users.noreply.github.com>

x-pack/platform/plugins/shared/fleet/server/services/epm/package_service.ts

@@ -120,15 +120,15 @@ export interface PackageClient {
   ): ReturnType<typeof getPackageInfo>;
 
   getPackages(params?: {
-    excludeInstallStatus?: false;
+    excludeInstallStatus?: boolean;
     category?: CategoryId;
-    prerelease?: false;
+    prerelease?: boolean;
   }): Promise<PackageList>;
 
   getAgentPolicyConfigYAML(
     pkgName: string,
     pkgVersion?: string,
-    prerelease?: false,
+    prerelease?: boolean,
     ignoreUnverified?: boolean
   ): Promise<string>;
 
@@ -296,7 +296,7 @@ class PackageClientImpl implements PackageClient {
   public async getAgentPolicyConfigYAML(
     pkgName: string,
     pkgVersion?: string,
-    prerelease?: false,
+    prerelease?: boolean,
     ignoreUnverified?: boolean
   ) {
     await this.#runPreflight(READ_PACKAGE_INFO_AUTHZ);
@@ -345,9 +345,9 @@ class PackageClientImpl implements PackageClient {
   }
 
   public async getPackages(params?: {
-    excludeInstallStatus?: false;
+    excludeInstallStatus?: boolean;
     category?: CategoryId;
-    prerelease?: false;
+    prerelease?: boolean;
   }) {
     const { excludeInstallStatus, category, prerelease } = params || {};
     await this.#runPreflight(READ_PACKAGE_INFO_AUTHZ);