updated check_upstream_golang.sh to properly set empty variables

[vineeth-bandi]

Issue #, if available:

Description of changes:
updated scripts to set empty variables when unable to find the proper version. Updated eks-distro-base/scripts/check_upstream_golang.sh to use yq to find version information.

➜  eks-distro-build-tooling git:(fix-go-version) ✗ make check-golang-release -C eks-distro-base
/eks-distro-build-tooling/eks-distro-base/scripts/check_upstream_golang
+ GO_PREFIX=go
+++ dirname /eks-distro-build-tooling/eks-distro-base/scripts/check_upstream_golang
++ cd /eks-distro-build-tooling/eks-distro-base/scripts
++ pwd -P
+ SCRIPT_ROOT=/eks-distro-build-tooling/eks-distro-base/scripts
+ VERSIONS_YAML=/eks-distro-build-tooling/eks-distro-base/scripts/../golang_versions.yaml
++ curl 'https://go.dev/dl/?mode=json'
++ jq -r '.[].version'
++ sed -e 's/^go//'
++ sort
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 23677  100 23677    0     0  55377      0 --:--:-- --:--:-- --:--:-- 55320
+ ACTIVE_VERSIONS='1.21.12
1.22.5'
+ for version in '${ACTIVE_VERSIONS}'
+++ echo 1.21.12
+++ awk -F. '{print NF}'
++ [[ 3 -ge 3 ]]
++ echo 1.21
+ MAJORVERSION=1.21
++ yq '.golang.versions["GOLANG_1.21_FULL_VERSION"]' /eks-distro-build-tooling/eks-distro-base/scripts/../golang_versions.yaml
+ MINIMAL_GO_VERSION=1.21.12-0
+ [[ ! 1.21.12-0 =~ 1.21.12 ]]
+ for version in '${ACTIVE_VERSIONS}'
+++ echo 1.22.5
+++ awk -F. '{print NF}'
++ [[ 3 -ge 3 ]]
++ echo 1.22
+ MAJORVERSION=1.22
++ yq '.golang.versions["GOLANG_1.22_FULL_VERSION"]' /eks-distro-build-tooling/eks-distro-base/scripts/../golang_versions.yaml
+ MINIMAL_GO_VERSION=1.22.5-0
+ [[ ! 1.22.5-0 =~ 1.22.5 ]]

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[natechensan]

/approve

[rcrozean]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: natechensan, rcrozean

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[rcrozean]

/lgtm