ci: ignore templated release branch links

[JSap0914]

What is changed, added, or deleted? (Required)

Fixes #3157.

The link workflows download the shared PingCAP .lycheeignore, which already excludes encoded tidb_operator_version template URLs. This PR appends the matching encoded tidb_operator_release_branch template URL pattern before running lychee in both the scheduled full link check and the pull-request fail-fast link check.

This keeps the documentation source using the release-branch variable while preventing lychee from treating the unrendered template placeholder as a real raw GitHub branch.

Source proof:

• Current variables.json sets tidb_operator_release_branch to release-2.0.
• The rendered target https://raw.githubusercontent.com/pingcap/tidb-operator/refs/heads/release-2.0/hack/get-grafana-dashboards.sh returns HTTP 200.
• The unrendered encoded placeholder URL reported by Broken Link Detected #3157 returns HTTP 404 before the new ignore pattern.
• Duplicate PR search before work and before PR creation returned no open PRs for Broken Link Detected #3157 / get-grafana-dashboards.sh / tidb_operator_release_branch.

Which TiDB Operator version(s) do your changes apply to? (Required)

• main (the latest development version for v2.x)
• v2.0 (TiDB Operator 2.0 versions)
• release-1.x (the latest development version for v1.x)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)

What is the related PR or file link(s)?

• Other reference link(s): Broken Link Detected #3157

Verification

• RED: lychee -E -i -n -t 45 --root-dir "$PWD" -- en/monitor-a-tidb-cluster.md zh/monitor-a-tidb-cluster.md failed with the two tidb_operator_release_branch raw URL 404s from Broken Link Detected #3157.
• GREEN: same focused lychee command after simulating the workflow append returned 0 Errors, 8 Excluded.
• python3 + PyYAML parsed .github/workflows/link.yml and .github/workflows/link-fail-fast.yaml successfully.
• git diff --check

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