AT-11105: Hardcoded HTTP api $default stage for the default base path

[rddimon]

Fixes #612

Description of Issue Fixed
Fixed stage for the api type http and base path default

More info https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-stages.html

Changes proposed in this pull request:

• Hardcoded $default for the HTTP api type and default base path
• Code formatting

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[amplify-self-hosted-runners]

Check Name	Conclusion	Summary	Output
SonarCloud Code Analysis	success	Quality Gate passed	output
Codacy Static Code Analysis	success	Your pull request is up to standards!	output
Mend Security Check	success	Security Report	output
Mend License Check	success	License Report	output
test (14.x)	success	test (14.x)	output
test (16.x)	success	test (16.x)	output
test (18.x)	success	test (18.x)	output
test (20.x)	success	test (20.x)	output