chore: update codecov configuration

[ryanchristo]

Description

Closes: #1151

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[ryanchristo]

I recommend taking a look at this to see where we might want to improve tests. Also it looks like some tests are not running as expected, in particular I noticed message validation for MsgBridge and MsgBridgeReceive are showing up with poor coverage maybe caused by misuse of t.Parallel(). 👀

https://app.codecov.io/gh/regen-network/regen-ledger/compare/1230/tree/x/ecocredit/core/msg_bridge.go
https://app.codecov.io/gh/regen-network/regen-ledger/compare/1230/tree/x/ecocredit/core/msg_bridge_receive.go