react-markdown: Upgrade to version 8.0.7 to be compatible with rollup

J=CLIP-1321
TEST=manual|auto

Ran `npm run test` and `npm run build` to ensure no errors

jest.config.json

@@ -15,5 +15,6 @@
     "\\.(css|scss|less)$": "<rootDir>/tests/__utils__/style-mock.ts",
     "react-markdown": "<rootDir>/node_modules/react-markdown/react-markdown.min.js"
   },
+  "transformIgnorePatterns": ["/node_modules/(?!react-markdown)/react-markdown.min.js"],
   "setupFilesAfterEnv": ["<rootDir>/tests/__setup__/setup.js"]
 }

src/components/Markdown.tsx

@@ -1,5 +1,4 @@
 import ReactMarkdown, { Options } from "react-markdown";
-import { PluggableList } from "unified";
 import remarkGfm from "remark-gfm";
 import rehypeRaw from "rehype-raw";
 import rehypeSanitize from "rehype-sanitize";
@@ -8,7 +7,7 @@ import { useReportAnalyticsEvent } from "../hooks/useReportAnalyticsEvent";
 import { useComposedCssClasses } from "../hooks/useComposedCssClasses";
 
 // The Remark and Rehype plugins to use in conjunction with ReactMarkdown.
-const unifiedPlugins: { remark?: PluggableList; rehype: PluggableList } = {
+const unifiedPlugins: { remark?: Options['remarkPlugins']; rehype: Options['rehypePlugins'] } = {
   remark: [
     remarkGfm, //renders Github-Flavored Markdown
   ],