[Cloud Security] use as const for const dicts for TS to infer correct types (#180566)

## Summary

using `as const` on exported const objects to allow TS infer the
narrowest possible types

Follow up on the CR comment 
- https://github.com/elastic/kibana/pull/179031#discussion_r1549592678

x-pack/plugins/cloud_security_posture/public/components/fleet_extensions/aws_credentials_form/aws_credentials_form.tsx

@@ -44,7 +44,7 @@ export type SetupFormat = typeof AWS_SETUP_FORMAT.CLOUD_FORMATION | typeof AWS_S
 export const AWS_SETUP_FORMAT = {
   CLOUD_FORMATION: 'cloud_formation',
   MANUAL: 'manual',
-};
+} as const;
 
 export const AWS_CREDENTIALS_TYPE = {
   ASSUME_ROLE: 'assume_role',
@@ -53,6 +53,7 @@ export const AWS_CREDENTIALS_TYPE = {
   SHARED_CREDENTIALS: 'shared_credentials',
   CLOUD_FORMATION: 'cloud_formation',
 } as const;
+
 export const AWSSetupInfoContent = ({ info }: AWSSetupInfoContentProps) => {
   return (
     <>

x-pack/plugins/cloud_security_posture/public/components/fleet_extensions/azure_credentials_form/azure_credentials_form.tsx

@@ -45,7 +45,7 @@ export type SetupFormat = typeof AZURE_SETUP_FORMAT.ARM_TEMPLATE | typeof AZURE_
 export const AZURE_SETUP_FORMAT = {
   ARM_TEMPLATE: 'arm_template',
   MANUAL: 'manual',
-};
+} as const;
 
 export const AZURE_CREDENTIALS_TYPE = {
   ARM_TEMPLATE: 'arm_template',

x-pack/plugins/cloud_security_posture/public/components/fleet_extensions/gcp_credentials_form/gcp_credential_form.tsx

@@ -46,15 +46,16 @@ import {
 export const GCP_SETUP_ACCESS = {
   CLOUD_SHELL: 'google_cloud_shell',
   MANUAL: 'manual',
-};
+} as const;
 
 export const GCP_CREDENTIALS_TYPE = {
   CREDENTIALS_FILE: 'credentials-file',
   CREDENTIALS_JSON: 'credentials-json',
   CREDENTIALS_NONE: 'credentials-none',
-};
+} as const;
 
 type SetupFormatGCP = typeof GCP_SETUP_ACCESS.CLOUD_SHELL | typeof GCP_SETUP_ACCESS.MANUAL;
+
 export const GCPSetupInfoContent = () => (
   <>
     <EuiHorizontalRule margin="xl" />