feat: variable descriptions (#8269)

* feat: add description column to various tables and enhance UI interactions
- Introduced a description column in Headers, VarsTable, and other components to allow multi-line descriptions.
- Added toggle buttons to show/hide the description column in relevant tables.
- Updated EditableTable component to support dynamic row addition with customizable labels.
- Enhanced UI for better user experience with consistent button styles and spacing adjustments.

* chore: resize fix handles

* fix: restrict column check for last index

* refactor: remove unwanted style and fix bottom padding of the last child in the table row

* tests: improve testability and fix impacted locators

* tests: fix locators for value fields

* fix: improve newline handling in description prefix

* fix: ts changes

* chore: remove redundant code and fix description roundtrip

* chore: remove redundant check

* tests(bru-lang): tests for description and annotation

* test: improve locators and tests

* tests: descriptions

* chore: re-add description setup

* fix: re-add description cols

* chore: fix the double click reset

* fix: account for hidden sidebar in request pane width calculation

* refactor: ui/ux fixes for data type toggle

* chore: inline common deps into bruno-lang and bruno-schema

* chore: tests

* chore: fix ux for descriptions

* fix: layout for environment vars table

* fix: ensure correct row selection for multipart file upload in tests

* feat: enhance UID assignment for request headers and variables in collections

* chore: simplify

* chore: update pkg

* chore: abstract the e2e utils

* chore: fix exports

* tests: fix locators for datatype vars

* fix: ux issue with secrets in environment table

* tests: update locators for collection headers and vars descriptions

* tests: update locators to use data attributes for datatype selectors

* chore: update default css width for actions column

* chore: remove tooltip for string type warnings

* fix: reduce name widths

* refactor: update annotation serialization to use single-quote delimiters for descriptions

* refactor(tests): simplify description formatting in jsonToEnv tests

* feat: add multiline description escaping and unescaping functions with tests

* refactor: clean up imports and improve multiline text block handling

* refactor: update locators to use new test IDs for environment variable editors

* refactor: streamline header input handling and improve environment variable row access

* refactor: update e2e-test job to support self-hosted runners

* refactor: update E2E test runner configuration to include e2e and macOS environments

---------

Co-authored-by: Pragadesh-45 <temporaryg7904@gmail.com>

tests/folder/description/fixtures/collection/api/folder.bru

@@ -0,0 +1,25 @@
+meta {
+  name: api
+}
+
+headers {
+  @description('''Single-line header desc''')
+  X-Version: 2.0
+  @description('''
+    Header line one
+    Header line two
+  ''')
+  X-Multi: value
+  X-Plain: plain-value
+}
+
+vars:pre-request {
+  @description('''Single-line var desc''')
+  baseUrl: https://example.com
+  @description('''
+    Var line one
+    Var line two
+  ''')
+  apiKey: abc123
+  plain: no-desc
+}

tests/folder/description/fixtures/collection/api/ping.bru

@@ -0,0 +1,11 @@
+meta {
+  name: ping
+  type: http
+  seq: 1
+}
+
+get {
+  url: https://example.com/ping
+  body: none
+  auth: none
+}

tests/folder/description/fixtures/collection/bruno.json

@@ -0,0 +1,5 @@
+{
+  "version": "1",
+  "name": "fold-description",
+  "type": "collection"
+}

tests/folder/description/fixtures/collection/collection.bru

@@ -0,0 +1,5 @@
+meta {
+  name: fold-description
+  type: collection
+  version: 1.0.0
+}