[CI] shorten ci name (linkedin#434)

## Summary
<!--- This is a required section; please describe the main purpose of
this proposed code change. --->

<!---
## Details
This is an optional section; is there anything specific that reviewers
should be aware of?
--->

## Testing Done
<!--- This is a required section; please describe how this change was
tested. --->

<!-- 
Replace BLANK with your device type. For example, A100-80G-PCIe

Complete the following tasks before sending your PR, and replace `[ ]`
with
`[x]` to indicate you have done them. 
-->

- Hardware Type: <BLANK>
- [ ] run `make test` to ensure correctness
- [ ] run `make checkstyle` to ensure code style
- [ ] run `make test-convergence` to ensure convergence

.github/workflows/amd-ci.yml

@@ -1,4 +1,4 @@
-name: AMD GPU CI
+name: AMD GPU
 
 on:
   push:

.github/workflows/nvi-ci.yml

@@ -1,4 +1,4 @@
-name: NVIDIA GPU CI
+name: NVIDIA GPU
 
 on:
   push: