Remove codecov from workflow (#2070)

## Description

It's unused and fails when run, so I'm removing it.

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_
- [ ] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2024.3.1
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added

Author: samfreund

.github/workflows/build.yml

@@ -108,14 +108,6 @@ jobs:
         run: ./gradlew testHeadless --stacktrace
       - name: Gradle Coverage
         run: ./gradlew jacocoTestReport
-      - name: Publish Coverage Report
-        uses: codecov/codecov-action@v4
-        with:
-          file: ./photon-server/build/reports/jacoco/test/jacocoTestReport.xml
-      - name: Publish Core Coverage Report
-        uses: codecov/codecov-action@v4
-        with:
-          file: ./photon-core/build/reports/jacoco/test/jacocoTestReport.xml
   build-offline-docs:
     name: "Build Offline Docs"
     runs-on: ubuntu-22.04