ci: exclude CHANGELOG.md from linting (#1964)

## Summary

- Exclude `CHANGELOG.md` from super-linter (editorconfig + prettier)
- Exclude `CHANGELOG.md` from lychee link checker

`CHANGELOG.md` is generated by release-please and contains long lines
and compare URLs that 404 until the release tag is published.

Fixes lint on
[#1962](#1962).

## Test plan

- [ ] Lint CI passes on this PR
- [ ] Re-run lint on #1962 after this merges

Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

.github/config/lychee.toml

@@ -10,7 +10,7 @@ max_concurrency = 4
 include_fragments = true
 
 base_url = "https://prometheus.github.io"
-exclude_path = ["docs/themes"]
+exclude_path = ["docs/themes", "CHANGELOG.md"]
 
 exclude = [
   # excluding links to pull requests and issues is done for performance

.github/config/super-linter.env

@@ -1,4 +1,4 @@
-FILTER_REGEX_EXCLUDE=mvnw|src/main/generated/.*|docs/themes/.*|keystore.pkcs12|.*.java|prometheus-metrics-exporter-opentelemetry-shaded/pom.xml|CODE_OF_CONDUCT.md|CLAUDE.md
+FILTER_REGEX_EXCLUDE=mvnw|src/main/generated/.*|docs/themes/.*|keystore.pkcs12|.*.java|prometheus-metrics-exporter-opentelemetry-shaded/pom.xml|CODE_OF_CONDUCT.md|CLAUDE.md|CHANGELOG.md
 IGNORE_GITIGNORED_FILES=true
 JAVA_FILE_NAME=google_checks.xml
 LOG_LEVEL=ERROR