Various fixes for Amazon Linux 2

[jakepetroules]

• Check out github-workflows into subdirectory: checkout@v1 and checkout@v4 differ in their behavior, try to make v1 clone the workflows repo in the same place as v4 so that on Amazon Linux 2 it doesn't try to run the script from the wrong location
• Don't use unnecessary piping: this causes script execution failures to be ignored when -o pipefail is not set.
• Add missing executable bit to install-and-build-with-sdk.sh script
• Don't install curl unnecessarily in order to save time (this became unnecessary with Update Android SDK build name to include NDK version #175, Always use the current version of the scripts (soundness checks) #180, Always use the current version of the scripts (Windows) #181, and Always use the current version of the scripts (Linux + Wasm) #182)

[FranzBusch]

Can you explain the motivation and/or add a test for it?

[jakepetroules]

I updated the description with the commit comments.

[justice-adams-apple]

LGTM