remove old and unused Cody search page (#63439)

This page (at `/cody/search`) let you type in a natural-language
description of what to search for, and then it used an LLM to rewrite
that to Sourcegraph search query syntax. This was enabled using the
`cody-web-search` feature flag, which has been disabled on dotcom for a
while and was never documented or shared with customers, so it's safe to
remove.

It was a cool idea, but we decided to focus on making Cody's search in
the editor better, and we haven't seriously improved this for ~12
months.

## Test plan

n/a; removed feature

Author: sqs

client/web/BUILD.bazel

@@ -272,9 +272,6 @@ ts_project(
         "src/cody/onboarding/instructions/JetBrains.tsx",
         "src/cody/onboarding/instructions/NeoVim.tsx",
         "src/cody/onboarding/instructions/VsCode.tsx",
-        "src/cody/search/CodySearchPage.tsx",
-        "src/cody/search/api.ts",
-        "src/cody/search/translateToQuery.ts",
         "src/cody/sidebar/CodySidebar.tsx",
         "src/cody/sidebar/Provider.tsx",
         "src/cody/sidebar/index.tsx",

client/web/src/LegacyLayout.tsx

@@ -1,12 +1,12 @@
-import { type FC, Suspense, useCallback, useLayoutEffect, useState } from 'react'
+import { Suspense, useCallback, useLayoutEffect, useState, type FC } from 'react'
 
 import classNames from 'classnames'
-import { matchPath, useLocation, Route, Routes, Navigate, type RouteObject } from 'react-router-dom'
+import { matchPath, Navigate, Route, Routes, useLocation, type RouteObject } from 'react-router-dom'
 
 import { useKeyboardShortcut } from '@sourcegraph/shared/src/keyboardShortcuts/useKeyboardShortcut'
 import { Shortcut } from '@sourcegraph/shared/src/react-shortcuts'
 import { useExperimentalFeatures } from '@sourcegraph/shared/src/settings/settings'
-import { useTheme, Theme } from '@sourcegraph/shared/src/theme'
+import { Theme, useTheme } from '@sourcegraph/shared/src/theme'
 import { lazyComponent } from '@sourcegraph/shared/src/util/lazyComponent'
 import { FeedbackPrompt, LoadingSpinner, useLocalStorage } from '@sourcegraph/wildcard'
 
@@ -64,7 +64,6 @@ export const LegacyLayout: FC<LegacyLayoutProps> = props => {
     const isSearchHomepage = location.pathname === '/search' && !parseSearchURLQuery(location.search)
     const isSearchJobsPage = routeMatch?.startsWith(PageRoutes.SearchJobs)
     const isSearchNotebooksPage = routeMatch?.startsWith(PageRoutes.Notebooks)
-    const isCodySearchPage = routeMatch === PageRoutes.CodySearch
     const isRepositoryRelatedPage = routeMatch === PageRoutes.RepoContainer ?? false
 
     // Since the access token callback page is rendered in a nested route, we can't use
@@ -188,7 +187,6 @@ export const LegacyLayout: FC<LegacyLayoutProps> = props => {
         !isSearchHomepage &&
         !isCommunitySearchContextPage &&
         !isSearchNotebooksPage &&
-        !isCodySearchPage &&
         !isSearchJobsPage
 
     return (