created helpers for getting domain and index for opensearch

[thetif]

💬 Description / Notes

Refactor to standard how we are getting the osDomain and index.

🛠 Changes

• created a helper method for getting and normalizing the domain and index from the environment variables
• updated code that got process.env.osDomain and/or process.env.indexNamespace to use the helper methods
• updated the code and tests as necessary
• updated appk tests to use mocked opensearch

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	80.64%	7139 / 8852
🔵	Statements	79.64%	7460 / 9367
🔵	Functions	71.89%	2077 / 2889
🔵	Branches	48.43%	1334 / 2754

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
lib/lambda/deleteIndex.ts	100%	66.66%	100%	100%
lib/lambda/getAttachmentUrl.test.ts	98.27%	100%	94.11%	98.07%	14-16
lib/lambda/getAttachmentUrl.ts	83.78%	70%	100%	83.78%	86-110
lib/lambda/getCpocs.ts	100%	100%	100%	100%
lib/lambda/getSubTypes.ts	93.33%	75%	100%	93.33%	66-69
lib/lambda/getTypes.ts	93.33%	75%	100%	93.33%	58-61
lib/lambda/itemExists.test.ts	100%	100%	100%	100%
lib/lambda/search.test.ts	100%	100%	100%	100%
lib/lambda/search.ts	90%	75%	100%	89.65%	54-56
lib/libs/sink-lib.ts	100%	93.33%	100%	100%
lib/libs/utils.ts	100%	100%	100%	100%
lib/libs/api/package/appk.test.ts	100%	100%	100%	100%
lib/libs/api/package/appk.ts	100%	100%	100%	100%
lib/libs/api/package/changelog.ts	100%	100%	100%	100%
lib/libs/api/package/getPackage.ts	100%	100%	100%	100%
lib/libs/api/package/itemExists.ts	100%	75%	100%	100%

Generated in workflow #1414 for commit 5222e57 by the Vitest Coverage Report Action