Harden link checker with retries and exclude flaky badge URL

Signed-off-by: Sean Chittenden <sean.chittenden@crowdstrike.com>

Author: sean-

.github/workflows/links.yml

@@ -13,7 +13,7 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2.7.0
         with:
-          args: --accept=200,403,429 --max-retries=3 --retry-wait-time=10 "**/*.html" "**/*.md" "**/*.txt" "**/*.json" --exclude "https://opensearch-domain.region.com/" --exclude "https://github.com/\[your*" --exclude "https://localhost:9200"
+          args: --accept=200,403,429 --max-retries=3 --retry-wait-time=10 "**/*.html" "**/*.md" "**/*.txt" "**/*.json" --exclude "https://opensearch-domain.region.com/" --exclude "https://github.com/\[your*" --exclude "https://localhost:9200" --exclude "https://codecov.io/gh/opensearch-project/opensearch-go/branch/main/graph/badge.svg"
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
       - name: Fail if there were link errors