collectionFormat 'pipes' is not properly handled in generated code

Description

The code is using 'pipe' to encode the array argument, while the corresponding COLLECTION_FORMAT constant is 'pipes'

content in base.ts:

export const COLLECTION_FORMATS = {
    csv: ",",
    ssv: " ",
    tsv: "\t",
    pipes: "|",
};

usage in code:

if (usernames) {
    localVarQueryParameter['usernames'] = usernames.join(COLLECTION_FORMATS.pipe);
}

Swagger-codegen version

3.0.25

Swagger declaration file content or url

    "/chat/client/list": {
      "get": {
        "tags": [
          "client-controller"
        ],
        "operationId": "findAllClients",
        "parameters": [
          {
            "name": "usernames",
            "in": "query",
            "required": false,
            "style": "pipeDelimited",
            "schema": {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          }
        ]
      }
    }

Command line used for generation

language=typescript-axios (generated with swagger-codgen-maven-plugin(v3)

Start with the TypeScript Axios generator output and the base.ts content shown in the issue, then reproduce generation using the provided pipeDelimited array parameter. Trace where the collection format is selected and verify the generated code uses the matching constant for pipe-delimited values.