[MM-45448] Force electron processes to close after every test on Windows (#2207)

e2e/specs/startup/app.test.js

@@ -21,6 +21,7 @@ describe('startup/app', function desc() {
         if (this.app) {
             await this.app.close();
         }
+        await env.clearElectronInstances();
     });
 
     it('MM-T4399_1 should show the new server modal when no servers exist', async () => {

e2e/specs/startup/config.test.js

@@ -22,6 +22,7 @@ describe('config', function desc() {
             // eslint-disable-next-line no-empty
             } catch (err) {}
         }
+        await env.clearElectronInstances();
     });
 
     describe('MM-T4401 should show servers in dropdown when there is config file', async () => {

e2e/specs/startup/window.test.js

@@ -22,6 +22,7 @@ describe('window', function desc() {
             // eslint-disable-next-line no-empty
             } catch (err) {}
         }
+        await env.clearElectronInstances();
     });
 
     // TODO: this fails on Linux right now due to the window frame for some reason