[ESQL] Fix license check (elastic#267919)

## Summary

Small fix to make the license check more robust.

Author: dej611

src/platform/packages/shared/kbn-esql-language/src/language/autocomplete/autocomplete.ts

@@ -80,7 +80,9 @@ export async function suggest(
 
   const activeProduct = resourceRetriever?.getActiveProduct?.();
   const licenseInstance = await resourceRetriever?.getLicense?.();
-  const hasMinimumLicenseRequired = licenseInstance?.hasAtLeast;
+  const hasMinimumLicenseRequired = licenseInstance
+    ? (license: LicenseType) => licenseInstance.hasAtLeast(license)
+    : undefined;
 
   if (astContext.type === 'newCommand') {
     // propose main commands here

src/platform/packages/shared/kbn-esql-language/src/language/validation/validation.ts

@@ -104,7 +104,9 @@ async function validateAst(
   }
 
   const license = await callbacks?.getLicense?.();
-  const hasMinimumLicenseRequired = license?.hasAtLeast;
+  const hasMinimumLicenseRequired = license
+    ? (minimumLicenseRequired: LicenseType) => license.hasAtLeast(minimumLicenseRequired)
+    : undefined;
 
   // Validate the header commands
   for (const command of headerCommands) {