refactor: Consolidate redundant code in workflow execution-functions (no-changelog) (#4884)

* refactor: Consolidate redundant code in workflow interfaces (no-changelog)

* consolidate all execution-functions interfaces code

* move rawBody definition back

* address PR comments

packages/nodes-base/nodes/Splunk/GenericFunctions.ts

@@ -20,7 +20,7 @@ export async function splunkApiRequest(
 	endpoint: string,
 	body: IDataObject = {},
 	qs: IDataObject = {},
-) {
+): Promise<any> {
 	const { authToken, baseUrl, allowUnauthorizedCerts } = (await this.getCredentials(
 		'splunkApi',
 	)) as SplunkCredentials;