Track the certified block that published a blob last

[ndr-ds]

Motivation

For example, if we know a certain blob was published, and we try to use it, but some of the validators don't have it, we need to be able to know the certificate that last used the blob so that we can sync validators to also have that blob. That's one use case for this, but there are more. Part of #2033

Proposal

Track what Certificate last used the blob. As of right now, the only "usage" is publishing a blob, but in the future we'll also use it in the read_blob system API call, when we replace Bytecode with blobs, etc.

Test Plan

CI + will use this in following PRs

[ndr-ds]

• Add blobs as oracle records #2162
• Endpoint to request which certificate published a blob last in a given validator #2158
• Track the certified block that published a blob last #2156 👈
• main

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[ndr-ds]

Merge activity

• Jun 20, 8:16 AM EDT: @andresilva91 started a stack merge that includes this pull request via Graphite.
• Jun 20, 8:17 AM EDT: Graphite rebased this pull request as part of a merge.
• Jun 20, 8:18 AM EDT: @andresilva91 merged this pull request with Graphite.