Revert "Restore Java 8 support in encoders lib"

[davidmotson]

Reverts #1627

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (a2ce65b) and head commit (83d4f804).

Test Logs

• Base (a2ce65b7): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1271219195786301442
• Head (83d4f804): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/1649/binary-size/1271497332138971137

Notes

Head commit (83d4f804) is created by Prow via merging commits: a2ce65b 34fcf98.

[google-oss-bot]

Coverage Report

Affected SDKs

No changes between base commit (a2ce65b) and head commit (83d4f804).

Test Logs

• Base (a2ce65b7): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1271219195786301441
• Head (83d4f804): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/1649/check-coverage-changed/1271497332138971138

Notes

HTML coverage reports can be produced locally with ./gradlew <product>:checkCoverage.
Report files are located at <product-build-dir>/reports/jacoco/.

Head commit (83d4f804) is created by Prow via merging commits: a2ce65b 34fcf98.

[google-oss-bot]

@davidmotson: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
device-check-changed	34fcf98	link	/test device-check-changed
smoke-tests	34fcf98	link	/test smoke-tests

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