bug/1763 correctly cache transactionalEmail during journey deployment

[JoernBerkefeld]

PR details

What changes did you make? (Give an overview)

• closes [BUG] related transactionalEmail not found during journey deploy #1763

Further details (optional)

...

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• test scripts updated
• Wiki updated (if applicable)

[github-actions]

Coverage Report

Commit:b636ecd
Base: develop@7542295

Type	Base	This PR
Total Statements Coverage	69.79%	69.77%  (-0.02%)
Total Branches Coverage	68.46%	68.43%  (-0.03%)
Total Functions Coverage	81.71%	81.71%  (+0%)
Total Lines Coverage	69.79%	69.77%  (-0.02%)

Details (changed files):

File	Statements	Branches	Functions	Lines
lib/metadataTypes/Event.js	54.6%	39.13%	70%	54.6%
lib/metadataTypes/Journey.js	59.17%	59.29%	75%	59.17%