[chore] remove unused nyc configs and dependencies (elastic#200909)

## Summary

nyc (istanbuljs) cleanup as we no longer collect code coverage for
functional tests

package.json

@@ -43,8 +43,6 @@
     "build": "node scripts/build --all-platforms",
     "build:apidocs": "node scripts/build_api_docs",
     "checkLicenses": "node scripts/check_licenses --dev",
-    "cover:functional:merge": "nyc report --temp-dir target/kibana-coverage/functional --report-dir target/coverage/report/functional --reporter=json-summary",
-    "cover:report": "nyc report --temp-dir target/kibana-coverage/functional --report-dir target/coverage/report --reporter=lcov && open ./target/coverage/report/lcov-report/index.html",
     "debug": "node --nolazy --inspect scripts/kibana --dev",
     "debug-break": "node --nolazy --inspect-brk scripts/kibana --dev",
     "dev-docs": "scripts/dev_docs.sh",
@@ -1346,8 +1344,6 @@
     "@emotion/babel-preset-css-prop": "^11.11.0",
     "@emotion/jest": "^11.11.0",
     "@frsource/cypress-plugin-visual-regression-diff": "^3.3.10",
-    "@istanbuljs/nyc-config-typescript": "^1.0.2",
-    "@istanbuljs/schema": "^0.1.2",
     "@jest/console": "^29.7.0",
     "@jest/reporters": "^29.7.0",
     "@jest/transform": "^29.6.1",

renovate.json

@@ -137,8 +137,6 @@
       "groupName": "@elastic/appex-qa dependencies",
       "matchDepNames": [
         "cheerio",
-        "@istanbuljs/nyc-config-typescript",
-        "@istanbuljs/schema",
         "@types/enzyme",
         "@types/faker",
         "@types/pixelmatch",

yarn.lock

@@ -3492,13 +3492,6 @@
     js-yaml "^3.13.1"
     resolve-from "^5.0.0"
 
-"@istanbuljs/nyc-config-typescript@^1.0.2":
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/@istanbuljs/nyc-config-typescript/-/nyc-config-typescript-1.0.2.tgz#1f5235b28540a07219ae0dd42014912a0b19cf89"
-  integrity sha512-iKGIyMoyJuFnJRSVTZ78POIRvNnwZaWIf8vG4ZS3rQq58MMDrqEX2nnzx0R28V2X8JvmKYiqY9FP2hlJsm8A0w==
-  dependencies:
-    "@istanbuljs/schema" "^0.1.2"
-
 "@istanbuljs/schema@^0.1.2", "@istanbuljs/schema@^0.1.3":
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.3.tgz#e45e384e4b8ec16bce2fd903af78450f6bf7ec98"