refactor: Unify severity and level for all application errors for Sentry (no-changelog) (#7956)

## Summary
Unify `severity` and `level` for all backend application errors for
Sentry

Follow-up to:
https://github.com/n8n-io/n8n/pull/7914#issuecomment-1840433542

...

#### How to test the change:
1. ...


## Issues fixed
Include links to Github issue or Community forum post or **Linear
ticket**:
> Important in order to close automatically and provide context to
reviewers

...


## Review / Merge checklist
- [ ] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [ ] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [ ] Tests included.
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from happening again. A feature is not complete without tests.
  >
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packages/core/src/NodeExecuteFunctions.ts

@@ -1528,7 +1528,7 @@ export async function httpRequestWithAuthentication(
 			throw new NodeOperationError(
 				node,
 				`Node "${node.name}" does not have any credentials of type "${credentialsType}" set!`,
-				{ severity: 'warning' },
+				{ level: 'warning' },
 			);
 		}
 
@@ -1722,7 +1722,7 @@ export async function requestWithAuthentication(
 			throw new NodeOperationError(
 				node,
 				`Node "${node.name}" does not have any credentials of type "${credentialsType}" set!`,
-				{ severity: 'warning' },
+				{ level: 'warning' },
 			);
 		}
 
@@ -1881,7 +1881,7 @@ export async function getCredentials(
 			throw new NodeOperationError(
 				node,
 				`Node type "${node.type}" does not have any credentials defined!`,
-				{ severity: 'warning' },
+				{ level: 'warning' },
 			);
 		}
 
@@ -1892,7 +1892,7 @@ export async function getCredentials(
 			throw new NodeOperationError(
 				node,
 				`Node type "${node.type}" does not have any credentials of type "${type}" defined!`,
-				{ severity: 'warning' },
+				{ level: 'warning' },
 			);
 		}
 
@@ -1917,14 +1917,14 @@ export async function getCredentials(
 			// Credentials are required so error
 			if (!node.credentials) {
 				throw new NodeOperationError(node, 'Node does not have any credentials set!', {
-					severity: 'warning',
+					level: 'warning',
 				});
 			}
 			if (!node.credentials[type]) {
 				throw new NodeOperationError(
 					node,
 					`Node does not have any credentials set for "${type}"!`,
-					{ severity: 'warning' },
+					{ level: 'warning' },
 				);
 			}
 		} else {
@@ -2903,7 +2903,7 @@ const getFileSystemHelperFunctions = (node: INode): FileSystemHelperFunctions =>
 			throw error.code === 'ENOENT'
 				? new NodeOperationError(node, error, {
 						message: `The file "${String(filePath)}" could not be accessed.`,
-						severity: 'warning',
+						level: 'warning',
 				  })
 				: error;
 		}
@@ -2911,7 +2911,7 @@ const getFileSystemHelperFunctions = (node: INode): FileSystemHelperFunctions =>
 			const allowedPaths = getAllowedPaths();
 			const message = allowedPaths.length ? ` Allowed paths: ${allowedPaths.join(', ')}` : '';
 			throw new NodeOperationError(node, `Access to the file is not allowed.${message}`, {
-				severity: 'warning',
+				level: 'warning',
 			});
 		}
 		return createReadStream(filePath);
@@ -2924,7 +2924,7 @@ const getFileSystemHelperFunctions = (node: INode): FileSystemHelperFunctions =>
 	async writeContentToFile(filePath, content, flag) {
 		if (isFilePathBlocked(filePath as string)) {
 			throw new NodeOperationError(node, `The file "${String(filePath)}" is not writable.`, {
-				severity: 'warning',
+				level: 'warning',
 			});
 		}
 		return fsWriteFile(filePath, content, { encoding: 'binary', flag });