Show data and report links in experiment CI

[DonggeLiu]

Show data and report links of public experiments.
It can also dynamically determine which report link to use.

Experiment \`${EXP_NAME}\` data and results will be available later at:
[The experiment data](https://storage.googleapis.com/fuzzbench-data/index.html?prefix=${EXP_NAME}/).
[The experiment report](https://storage.googleapis.com/www.fuzzbench.com/reports/${EXP_NAME}/index.html).
[The experiment report(experimental)](https://storage.googleapis.com/www.fuzzbench.com/reports/experimental/${EXP_NAME}/index.html).