Replace TenantIndex, BlockMeta and CompactedBlockMeta with proto near-equivalents #9113

Job	Run time
Lint	3m 2s
Build	1m 35s
Run integration tests (test-e2e)	2m 7s
Benchmark	2m 9s
Run integration tests (test-integration-poller)	2m 17s
Run Unit Tests (test-with-cover-pkg)	2m 59s
Run integration tests (test-e2e-deployments)	2m 8s
Run Unit Tests (test-with-cover-tempodb)	5m 31s
Build technical documentation	19s
Run integration tests (test-e2e-serverless)	2m 2s
Run Unit Tests (test-with-cover-tempodb-wal)	5m 32s
Run Unit Tests (test-with-cover-others)	5m 16s
Check jsonnet & tempo-mixin	48s
Vendor check	1m 21s
	37m 6s

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