Refactor and centralize file mimeType integrity check and sanitization (#20889)

# Introduction
closes https://github.com/twentyhq/private-issues/issues/484

This PR refactors the writeFile API to never expect to be passed a
mimetype, its extract is done programmatically low level so any callers
will pass through
Same for the file sanitization

## IANA override
Disclaimer for consistency we existing behavior we wanted to always have
`application/typescript`
- should we rather consider fallbacking to octect-steam instead ?
- Any pulbic assets that has .ts will now also fallback to
`application/typescript` instead of the official IANA

## Integration
Added coverage

packages/twenty-server/src/engine/core-modules/logic-function/logic-function-resource/logic-function-resource.service.ts

@@ -94,7 +94,6 @@ export class LogicFunctionResourceService {
       fileFolder: FileFolder.Source,
       resourcePath: sourceHandlerPath,
       sourceFile: sourceFile.content,
-      mimeType: 'application/typescript',
       settings: {
         isTemporaryFile: false,
         toDelete: false,
@@ -107,7 +106,6 @@ export class LogicFunctionResourceService {
       fileFolder: FileFolder.BuiltLogicFunction,
       resourcePath: builtHandlerPath,
       sourceFile: builtFile.content,
-      mimeType: 'application/javascript',
       settings: {
         isTemporaryFile: false,
         toDelete: false,
@@ -139,7 +137,6 @@ export class LogicFunctionResourceService {
       resourcePath: sourceHandlerPath,
       sourceFile: sourceHandlerCode,
       settings: { isTemporaryFile: false, toDelete: false },
-      mimeType: 'application/typescript',
       queryRunner,
     });
   }
@@ -172,7 +169,6 @@ export class LogicFunctionResourceService {
       fileFolder: FileFolder.BuiltLogicFunction,
       resourcePath: builtHandlerPath,
       sourceFile: builtCode,
-      mimeType: 'application/javascript',
       settings: {
         isTemporaryFile: false,
         toDelete: false,