Add description for ActivationType in Common.py

[StaceyLai]

Add a description for ActivationType in common.py to help users be aware of the need to set this field.
ActivationType now supports "all", "hipblaslt_all" and "none". There are two reasons why it's not suitable to directly assign a default value to ActivationType now: 1. It's unclear whether the source is from Tensile or hipBLASLT; 2. It may cause a mismatch between the solution's config and the problemType.

[StaceyLai]

local CI pass:

[----------] 1 test from ExtOpTest/ExtOpAMaxWithScaleUnsupportedDatatypeTest
[ RUN ] ExtOpTest/ExtOpAMaxWithScaleUnsupportedDatatypeTest.amaxWithScaleFailureUnsupportedDatatype/0
[ OK ] ExtOpTest/ExtOpAMaxWithScaleUnsupportedDatatypeTest.amaxWithScaleFailureUnsupportedDatatype/0 (0 ms)
[----------] 1 test from ExtOpTest/ExtOpAMaxWithScaleUnsupportedDatatypeTest (0 ms total)

[----------] Global test environment tear-down
[==========] 48206 tests from 13 test suites ran. (1278982 ms total)
[ PASSED ] 48206 tests.
hipBLASLt version: 1000

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
---------- generated xml file: /stacelai/tensilelite/python_tests.xml ----------
========= 76 passed, 32 skipped, 1253 warnings in 11693.87s (3:14:53) ==========
py3: exit 0 (11694.12 seconds) /stacelai/tensilelite> py.test -v --basetemp=/stacelai/tensilelite/CI_out/py3/tmp --junit-xml=/stacelai/tensilelite/python_tests.xml --junit-prefix=py3 --color=yes -n 4 --prebuilt-client=/stacelai/tensilelite/CI_out/py3/client/0_Build/client/tensile_client Tensile/Tests -m common pid=2697306
py3: OK (11837.06=setup[11.06]+cmd[0.63,131.25,11694.12] seconds)
congratulations :) (11837.13 seconds)

[jichangjichang]

ActivationType also support single activation except "none", "all" and "relu".

[jayhawk-commits]

Please resolve merge conflicts or close this PR to complete the task of importing PRs from this repo to the monorepo.