Update CHANGELOG.md for release-3.0

[dimitarvdimitrov]

Add missing changelog entries from the following PRs:

• ruler: add support for remote rule evaluation over HTTP #11415
• ruler: change ruler.RemoteQuerier.client to an http.RoundTripper #11833
• Block-builder-scheduler: Job monitor. #11867
• PromQL: Fix invalid source label name in label_join error message #12185
• index planning: implement cost model predicate #12197
• index planning: implement cost model plan #12199
• ingester: provide noop lookup planner and add index-lookup-planning-enabled config flag #12245
• index planning: implement cost model planner  #12248
• mimir-mixin: relax the guard in IngesterHasUnshippedBlocks when block-builder is running #12319
• distributor: Optimize RW1 -> RW2 translation #12329
• Add postings cache sharing and invalidation to ingesters #12333
• Bring in head stats collection, config, and metrics #12407
• Expose rollout_operator_enabled into $._config #12419
• lookupplan: Add ContextWithDisabledPlanning functionality #12457
• lookupplan: Mirror Select calls with and without planner #12460
• continuous-test: Add new test for verifying ingest-storage record correctness #12500
• Pull statistics into planner #12530
• mimirpb: Preserve inconsistent metric metadata in RW1 to 2 conversion #12541
• Report head statistics collection metrics #12550
• Replace BlockBuilderLagging alert with BlockBuilderSchedulerPendingJobs #12593
• Only log plans starting with those that have at least one index matcher #12597
• ingester: Add IndexLookupPlannerFunc support #12603
• index planning: Disable planning for blocks older than 3 hours #12608
• Block-builder: clean up dashboard and metrics #12631
• Calculate plan costs only once #12658
• index planning: use planning for all sizeable blocks #12696
• index planning: log predicates to spans #12731
• index planning: Remove unnecessary error handling  #12738
• inex planning: Add statistics generation for head block #12752
• index planning: fix config defaults and validation #12755
• ingest-storage: Do not deduplicate metadata by family name when unmarshalling #12804
• index planning: Add query cardinality metrics #12807
• lookup planning: adjust plan's intersection cost #12830
• continuous-test: Fix false positive in continuous tester metadata assertion #12891
• index planning: add configurable cost #12896
• Build postings cache factories per ingester #12932
• index planning: use pools for CostBasedPlanner slices #13039
• kafkatool: print write requests as JSON #12737

[mimir-github-bot]

The backport to release-3.0 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-13065-to-release-3.0 origin/release-3.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x d6c25f0b0295304cd4fd727cc0e1cc161569bcfc
# Push it to GitHub
git push --set-upstream origin backport-13065-to-release-3.0
git switch main
# Remove the local backport branch
git branch -D backport-13065-to-release-3.0

Then, create a pull request where the base branch is release-3.0 and the compare/head branch is backport-13065-to-release-3.0.