Copy previous categorisations from multiple tables not just one

[RayStick]

Closes #110
See description of issue for what this PR is solving

For PR reviewers to test:

• Process 3 tables in this order: CHILD, BREAST_FEEDING and CHILD_BIRTHS
• The previously code only copied from the last table
• You can now see that CHILD_BIRTHS copies lots from CHILD, which is the desired functionality

Checklist before review:

• Please comment on my PR while it's a draft and give me feedback on the development!
• I added everything I wanted to add to this PR, please review!
• The title of this PR is clear and self-explantory.
• I added any appropriate labels to this PR.

[Rainiefantasy]

I seem to always have issues XD
Ran:

devtools::load_all()
domain_mapping()

When entering table numbers to process:
I get the table name, and table last updated returned. Then I get an error message:
Error in distinct(., DataElement, .keep_all = TRUE) : could not find function "distinct"

[RayStick]

my mistake - just made another commit - please try again :)

[Rainiefantasy]

Adding to above -

• when running domain_mapping() I get the above error, but when I run domain_mapping(output_dir="/test") (with directory), it lets me process the table but then at the end I get another error after reviewing categorisations:
  Would you like to review your categorisations? (y/n): n Error in file(file, ifelse(append, "a", "w")) : cannot open the connection In addition: Warning message: In file(file, ifelse(append, "a", "w")) : cannot open file '/test/OUTPUT_NationalCommunityChildHealthDatabase(NCCHD)_CHILD_2024-07-24-15-03-30.csv': No such file or directory
  This is on the copy-more-tables branch

[Rainiefantasy]

Ignore this -- forgot to do the devtools::load_all()
From the changes pushed, I can now process table 2, but it errors on the second table with a similar distinct function error:
Error in distinct(., DataElement, .keep_all = TRUE) : could not find function "distinct"

[Rainiefantasy]

Looks great to me! categorisations copied from the child table to the child births table as expected

[Rainiefantasy]

Reviewed changes and tested - output as expected, so approving for merge :)