[Fleet] Reuse package infos for synthetics bulk ops (#191486)

## Summary

 Reuse package infos for synthetics bulk ops !!

We are just trying to debug Project monitor push API which interacts
with fleet code and trying to see what excessive calls are being made,
which can be reduced.

x-pack/plugins/fleet/server/services/package_policy.ts

@@ -105,7 +105,12 @@ import { getAuthzFromRequest, doesNotHaveRequiredFleetAuthz } from './security';
 
 import { storedPackagePolicyToAgentInputs } from './agent_policies';
 import { agentPolicyService } from './agent_policy';
-import { getPackageInfo, getInstallation, ensureInstalledPackage } from './epm/packages';
+import {
+  getPackageInfo,
+  getInstallation,
+  ensureInstalledPackage,
+  getInstallationObject,
+} from './epm/packages';
 import { getAssetsDataFromAssetsMap } from './epm/packages/assets';
 import { compileTemplate } from './epm/agent/agent';
 import { escapeSearchQueryPhrase, normalizeKuery as _normalizeKuery } from './saved_object';
@@ -1874,9 +1879,25 @@ class PackagePolicyClientImpl implements PackagePolicyClient {
   public async buildPackagePolicyFromPackage(
     soClient: SavedObjectsClientContract,
     pkgName: string,
-    logger?: Logger
+    options?: { logger?: Logger; installMissingPackage?: boolean }
   ): Promise<NewPackagePolicy | undefined> {
-    const pkgInstall = await getInstallation({ savedObjectsClient: soClient, pkgName, logger });
+    const pkgInstallObj = await getInstallationObject({
+      savedObjectsClient: soClient,
+      pkgName,
+      logger: options?.logger,
+    });
+    let pkgInstall = pkgInstallObj?.attributes;
+    if (!pkgInstall && options?.installMissingPackage) {
+      const esClient = await appContextService.getInternalUserESClient();
+      const result = await ensureInstalledPackage({
+        esClient,
+        pkgName,
+        savedObjectsClient: soClient,
+      });
+      if (result.package) {
+        pkgInstall = result.package;
+      }
+    }
     if (pkgInstall) {
       const packageInfo = await getPackageInfo({
         savedObjectsClient: soClient,

x-pack/plugins/fleet/server/services/package_policy_service.ts

@@ -164,7 +164,7 @@ export interface PackagePolicyClient {
   buildPackagePolicyFromPackage(
     soClient: SavedObjectsClientContract,
     pkgName: string,
-    logger?: Logger
+    options?: { logger?: Logger; installMissingPackage?: boolean }
   ): Promise<NewPackagePolicy | undefined>;
 
   runExternalCallbacks<A extends ExternalCallback[0]>(

x-pack/plugins/observability_solution/synthetics/server/synthetics_service/private_location/synthetics_private_location.ts

@@ -52,7 +52,7 @@ export class SyntheticsPrivateLocation {
     const newPolicy = await this.server.fleet.packagePolicyService.buildPackagePolicyFromPackage(
       soClient,
       'synthetics',
-      this.server.logger
+      { logger: this.server.logger, installMissingPackage: true }
     );
 
     if (!newPolicy) {