[COMPLIANCE] Add Copyright and License Headers (#1920)

Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>

ui/desktop/app/components/session/proxy-url/index.hbs

@@ -1,3 +1,8 @@
+{{!
+  Copyright (c) HashiCorp, Inc.
+  SPDX-License-Identifier: MPL-2.0
+~}}
+
 <div class='proxy-url-container'>
   <Hds::Dropdown @listPosition='bottom-left' as |dd|>
     <dd.ToggleButton @color='secondary' @text={{this.selectedValue}} />

ui/desktop/app/components/session/tabs/index.js

@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
 import Component from '@glimmer/component';
 import { action } from '@ember/object';
 import { inject as service } from '@ember/service';