Don't use hardcoded server url

[ashu8912]

While making request to external proxy on the backend here(

plugins/app-catalog/src/api/charts.tsx

Line 24 in 2d1db6a

return fetch(`http://localhost:4466/externalproxy`, {

and

plugins/app-catalog/src/api/charts.tsx

Line 31 in 2d1db6a

export function fetchChartValues(packageID: string, packageVersion: string) {

) We are using hardcoded server url, this should not be the case as when if something is already running on this port the user can start server on a different port, in that case this request will fail.

Possible solution
One way that i could think of is, Pass the server url from elctron main process to renderer process and use that as the server url here

Acceptance criteria
When making request to external proxy we use the dynamic server link generated in the electron main process