[typescript-node] Specifying the --model-name-suffix CLI argument leads to generating incorrect imports in models

Description

Specifying the --model-name-suffix CLI argument leads to generating incorrect imports in the model TypeScript files.
Namely, the suffix gets appended twice to the module name referenced in the import declaration. I.e. assuming that the generator was invoked with --model-name-suffix Model, it produces

import userModel from './userModelModel

instead of

import userModel from './userModel

openapi-generator version

@openapitools/openapi-generator-cli": "^2.2.1"
JAR version: 5.0.1

Command line used for generation

cross-env-shell TS_POST_PROCESS_FILE=\"node node_modules/prettier/bin-prettier.js --write\" npx @openapitools/openapi-generator-cli generate -i openapi.yaml -g typescript-node -o customerserviceapi --skip-validate-spec --model-name-suffix Model --additional-properties=supportsES6=true,enumPropertyNaming=original,generateAliasAsModel=false,enablePostProcessFile=true,nestVersion=7.5.1

Steps to reproduce

Generate the TypeScript files with the command line specified above. Unfortunately I cannot share the Open API spec as it's private - but it looks like an issue with the generator templates rather than with a specific OpenAPI spec.

Suggest a fix/enhancement

1. Make a folder for customized code generator tempates, e.g. mkdir templates && cd templates
2. Extract the templates with npx @openapitools/openapi-generator-cli author template -g typescript-node
3. Open model.mustache in a text editor
4. On line 6, replace import { {{classname}} } from '{{filename}}'; with import { {{classname}} } from './{{classname}}';
5. Save the modified model.mustache
6. Specify the customized templates with the -t templates CLI argument

Start with the typescript-node generator's model.mustache template, especially the import declaration described in the issue, and reproduce the output using the supplied generation command with --model-name-suffix Model. Done means generated model files import the module with the suffix only once; the issue does not name a test to run.