Replace TenantIndex, BlockMeta and CompactedBlockMeta with proto near-equivalents #9112

Job	Run time
Lint	2m 57s
Benchmark	2m 6s
Build	1m 33s
Check jsonnet & tempo-mixin	51s
Run integration tests (test-e2e)	2m 3s
Run Unit Tests (test-with-cover-pkg)	3m 4s
Run integration tests (test-integration-poller)	2m 20s
Vendor check	1m 19s
Run Unit Tests (test-with-cover-tempodb)	3m 52s
Run integration tests (test-e2e-deployments)	2m 6s
Run Unit Tests (test-with-cover-tempodb-wal)	3m 51s
Build technical documentation	19s
Run integration tests (test-e2e-serverless)	2m 8s
Run Unit Tests (test-with-cover-others)	3m 52s
	32m 21s

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