ci: Add codecov flags per codebase

[maurelian]

Description

Activates CodeCov's flags feature.

[changeset-bot]

⚠️ No Changeset found

Latest commit: fdaef72

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[codecov-commenter]

Codecov Report

Base: 56.81% // Head: 62.75% // Increases project coverage by +5.94% 🎉

Coverage data is based on head (fdaef72) compared to base (f966091).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3568      +/-   ##
===========================================
+ Coverage    56.81%   62.75%   +5.94%     
===========================================
  Files          311      129     -182     
  Lines        16655     3410   -13245     
  Branches       752      625     -127     
===========================================
- Hits          9462     2140    -7322     
+ Misses        6404     1241    -5163     
+ Partials       789       29     -760     

Impacted Files	Coverage Δ
op-service/metrics/http.go
op-node/rollup/driver/step.go
op-node/p2p/rpc_server.go
op-node/rollup/derive/engine_queue.go
op-node/p2p/rpc_client.go
op-node/node/node.go
op-node/rollup/driver/conf_depth.go
op-proposer/drivers/l2output/driver.go
packages/core-utils/src/optimism/rollup-types.ts
op-chain-ops/immutables/immutables.go
... and 172 more

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