Fix compactor ignore configurable S3 headers

[Batkilin]

What this PR does: Fix bug in compactor use of s3 headers

Which issue(s) this PR fixes:
Fixes #3149

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

Hi :)
I am not a Go dev, but I need this fixed in order to use Tempo on my environment, It would be great if someone can help me complete the Checklist and merge this

[CLAassistant]

All committers have signed the CLA.

[joe-elliott]

Nice fix! We appreciate the contribution.

[github-actions]

The backport to release-v2.3 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-3154-to-release-v2.3 origin/release-v2.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 57c3300b565b6d92fe423b91241081a6fe4d84a0

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-3154-to-release-v2.3
# Create the PR body template
PR_BODY=$(gh pr view 3154 --json body --template 'Backport 57c3300b565b6d92fe423b91241081a6fe4d84a0 from #3154{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title "[release-v2.3] Fix compactor ignore configurable S3 headers" --body-file - --label "type/bug" --label "backport" --base release-v2.3 --milestone release-v2.3 --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-3154-to-release-v2.3

# Create a pull request where the `base` branch is `release-v2.3` and the `compare`/`head` branch is `backport-3154-to-release-v2.3`.

# Remove the local backport branch
git switch main
git branch -D backport-3154-to-release-v2.3