fix: Handle scientific notation in label hex colors

[PendaGTP]

Fixes #707

Properly convert numeric hex colors that could be interpreted as scientific notation (e.g. 5319e7)

Before

labels:
  - name: "example"
    color: 5319e7  # 53190000000

After

labels:
  - name: "example"
    color: 5319e7  # 5319e7

[anderssonjohan]

@PendaGTP Please provide a test for your code. Such as:

const actualString = parseColorFromScientificNumber(5319e7);

expect(actualString).toEqual('5319e7');

Do you get these results with the provided code?