fix(amazonq): Release mynah-ui v 4.15.8 with bug fixes (#4836)

Release new version of MynahUI with the following bug fixes:
- Fix copy pasting inline code texts aws/mynah-ui#98
- Fix disabled commands not filtered in quick actions

MynahUI v4.15.8 release notes: https://github.com/aws/mynah-ui/releases/tag/v4.15.8

Author: rahmaniaam

.changes/next-release/bugfix-0ccdf63e-6477-4f50-a0cb-c3bc10fce622.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Fix bug where text with inline code copied from Amazon Q Chat had new line breaks around the inline code text"
+}

.changes/next-release/bugfix-3cb3570e-fd8f-4423-91cc-bc5513b7196f.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Fix bug when disabled commands does not get filtered in quick actions"
+}

plugins/amazonq/mynah-ui/package-lock.json

@@ -12,7 +12,7 @@
         "lintfix": "eslint -c .eslintrc.js --fix --ext .ts ."
     },
     "dependencies": {
-        "@aws/mynah-ui-chat": "npm:@aws/[email protected].6",
+        "@aws/mynah-ui-chat": "npm:@aws/[email protected].8",
         "@types/node": "^14.18.5",
         "fs-extra": "^10.0.1",
         "ts-node": "^10.7.0",