Fix spelling for 46 migrate related words

I really must remember to leave a not when I intend to do a self review.

#4
1,2,4 Fixed
3, 5. Yea, the -able words are challenging, it seems to depend on which dictionary you check.
validatable is identified as a spelling error in two files, core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php, core/modules/migrate/src/Plugin/MigrateValidatableEntityInterface.php. And it does only appear twice,

$grep -ri validatable core | awk -F: '{print $1}' | sort -u
core/misc/cspell/dictionary.txt
core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
core/modules/migrate/src/Plugin/MigrateValidatableEntityInterface.php

I decided to change it since the word is limited to the migration system.

Similarly, throttable, is also limited to the migrate system and specifically a Drupal 6 test. I see no reason not to change it.

grep -ri throttleable core | awk -F: '{print $1}' | sort -u
core/misc/cspell/dictionary.txt
core/modules/migrate_drupal/tests/src/Unit/source/d6/Drupal6SqlBaseTest.php

6. Changed the contents of ds9.txt to '***'. ds9.txt is in the Drupal7 test fixture as well so it could be tested in any Migration Kernel test. I'll let the testbot find any failures. This change also means 'terok' can be removed from the list as well.
I do think phenaproxima will be disappointed 2673960-#50.
7. Interesting. The other occurrences are in Migrate test files and this one is a Migrate test base class. We could add an exclusion for those but I'd rather not since some are in migrate module, list below. I think we need to keep this change.

$ find . -name \*Migrate\*TestBase.php
./core/modules/path/tests/src/Kernel/Migrate/d7/MigrateUrlAliasTestBase.php
./core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeExecuteTestBase.php
./core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
./core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6TestBase.php
./core/modules/migrate_drupal/tests/src/Kernel/d7/MigrateDrupal7TestBase.php
./core/modules/migrate_drupal/tests/src/Kernel/MigrateDrupalTestBase.php
./core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php
./core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php
./core/modules/migrate/tests/src/Kernel/MigrateTestBase.php
./core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTestBase.php

I've been interrupted a few time while working on this and it feels like I have forgotten something.

@vikashsoni, When a patch no longer apply you can just leave a comment that it no longer applies and tag as 'needs reroll'. Sceenshots of applying a patch are not useful. Removing credit as per How is credit granted for Drupal core issues.

Rerolled the patch and fixed new occurrences of 'foobaz' in MigrationLookupTest. There are two more fixes to make, but it is too late to start that.

/var/www/html/core/modules/migrate_drupal_ui/tests/src/Functional/d7/FilePathTest.php:279:24 - Unknown word (Terok)
/var/www/html/core/modules/migrate_drupal_ui/tests/src/Functional/d7/FilePathTest.php:280:31 - Unknown word (Terok)

Looks like I really needed to get to bed.

Added a cspell:ignore line for 'terok'.

Looks like random failing, #3056848: Investigate LayoutBuilderDisableInteractionsTest random fails further. Retesting

Passing tests again, setting back to RTBC.

Yes, I did forget to update the file_managed table. If you open up a new issue for that I will make a patch later this week, setting the size to 4.

Although they are test files, I am not convinced that excluding that directory from cspell is the solution.