Terraform

IMPROVEMENTS:

• The filemd5, filesha1, etc functions from Terraform v0.12 are backported primarily to allow writing modules that can work in both Terraform 0.11 and 0.12, since the sha1(file("...")) pattern in 0.12 works only for files containing valid UTF-8 text; sha1file("...") must be used instead. Both forms are equivalent in Terraform 0.11.
• backend/remote: Retry calls when the remote backend responds with a server error (#20589)
• backend/remote: Check for external updates while waiting for user input (#20622)

BUG FIXES:

• backend/remote: Fix "token too long" errors when streaming remote operation logs (#20241)
• backend/remote: Use the can-queue-apply permission to detect if apply is allowed (#20462)
• backend/remote: Exit with 1 when a remote run is canceled (#20482)
• core: Use slashes in the module manifest to prevent Windows/Linux compatibility issues (#20246)